The fan-made prestige class scarlet squirrel, runner-up in Wizards of the Coast's 2001 online Prestige Class Contest, possesses the natural ability weresquirrel that, in part, says, "The character can polymorph into any known squirrel form recognized by the DM, in the same manner as a druid's" supernatural ability wild shape.

In updating this prestige class for possible use in a Dungeons & Dragons 3.5 campaign, I was struck by the dearth of official possible squirrel forms.

First, have I overlooked any official squirrels or squirrel-adjacent creatures?

Second, as the DM, I'd like to recognize more squirrels. To that end, in first party, licensed, and third-party products what other squirrels exist? That is, what creatures have the actual word squirrel in their names?

Further, in first party, licensed, and third-party products, what other squirrel-adjacent creatures exist? That is, what creatures are described as being somehow squirrel-like, either because they are or are believed to be descended from, offshoots of, or otherwise somehow related to squirrels or because they are described as being like a squirrel in appearance or behavior? (This last—behavior—is a last-ditch criterion that's included only to allow an answer to expand the question's mandate if the previous criteria result in slim pickings.)

As the prestige class scarlet squirrel is a 9-level class, there's no need to go beyond squirrel and squirrel-adjacent creatures of greater than 9 Hit Dice and, for my purposes, a focus on 7 Hit Dice and below is preferred, but I don't want to artificially restrain the squirrel expert. The prestige classes legacy champion and uncanny trickster are a thing, and if some third-party source includes, like, a 25-Hit Dice squirrel kaiju, Squirrelzilla's inclusion in an answer certainly wouldn't be frowned upon.

To be clear, I'm not interested in the myriad of ways that a DM can modify squirrels with, for instance, templates or spells—I already know that such options exist and that I can use them. Instead, I'm looking for standalone new creatures. Also, for my own reasons, I'd rather not use Pathfinder material, but, again, I want to accommodate the squirrel expert, so if there's a perfect Pathfinder creature, this asker won't reject that answer out of hand.

The fan-made prestige class scarlet squirrel (see also this question) at level 3 gains the natural ability weresquirrel that, in part, says, "The character can polymorph into any known squirrel form recognized by the DM, in the same manner as a druid's" supernatural ability wild shape.

While updating this prestige class for possible use in a Dungeons & Dragons 3.5 campaign, I was struck by the dearth of official possible squirrel forms.

As the DM, I'd like to recognize more squirrels. To that end, in first party, licensed, and third-party products what other squirrels exist? That is, what creatures have the actual word squirrel in their names?

Further, in first party, licensed, and third-party products, what other squirrel-adjacent creatures exist? That is, what creatures are described as being squirrel-like? To be clear, like the above examples illustrate, I'm interested only in creatures that are specifically squirrel-like. For instance, even a chipmunklike [sic] creature isn't squirrel enough, so if a creature's description doesn't mention squirrels—even if such a creature seems like it should be squirrel-adjacent and even if such a creature does have a supercute name like the berrygobbler (Silver Marches 41)—, it just won't do.

As the prestige class scarlet squirrel is a 9-level class, an emphasis on squirrels and squirrel-adjacent creatures that possess no more than 9 Hit Dice is preferred.

Finally, I don't need the myriad of ways that a DM can modify squirrels with, for instance, templates or spells—I already know that such options exist and that I can use them. I'm looking only for standalone squirrels and squirrel-adjacent creatures.

The fan-made prestige class scarlet squirrel, runner-up in Wizards of the Coast's 2001 online Prestige Class Contest, possesses the natural ability weresquirrel that, in part, says, "The character can polymorph into any known squirrel form recognized by the DM, in the same manner as a druid's" supernatural ability wild shape.

In updating this prestige class for possible use in a Dungeons & Dragons 3.5 campaign, I was struck by the dearth of official possible squirrel forms: To my knowledge, there's only the flying squirrel (Dragon #327 87) and the traditional squirrel that originally appeared as a unique new creature (Dragon #280 60, 61) yet was updated by the 3.5 revision (Dragon #341 89) to have statistics identical to that of the rat (MM 278)—which is a little insulting but, honestly, understandable—, and the squirrel-adjacent creatures the ratatosk (Expedition to the Demonweb Pits 110–11) and the skiurid (Monster Manual IV 126–7).

First, have I overlooked any official squirrels? Second, as the DM, I'd like to recognize more squirrels, so in licensed and third-party products what squirrels and squirrel-adjacent creatures exist that possess no more than 9 Hit Dice? (The prestige class scarlet squirrel is a 9-level class.) I'd like to, if at all possible, avoid Pathfinder material.

By the way, I'm not interested in the myriad of ways that a DM can modify squirrels with, for instance, templates and spells but, instead in unique creatures that are squirrels or squirrel-like.

The fan-made prestige class scarlet squirrel, runner-up in Wizards of the Coast's 2001 online Prestige Class Contest, possesses the natural ability weresquirrel that, in part, says, "The character can polymorph into any known squirrel form recognized by the DM, in the same manner as a druid's" supernatural ability wild shape.

In updating this prestige class for possible use in a Dungeons & Dragons 3.5 campaign, I was struck by the dearth of official possible squirrel forms.

Actual squirrels seems to include only the flying squirrel (Dragon #327 87) and the traditional squirrel that originally appeared as a unique new creature (Dragon #280 60, 61) yet was updated by the 3.5 revision (Dragon #341 89) to have statistics identical to that of the rat (MM 278)—which is a little insulting but, honestly, understandable.

Squirrel-adjacent creatures seem to include only the ratatosk that's described as a "furry, humanoid-shaped creature [that] resembles a bipedal rodent [with] clawed hands, large eyes set in a squirrel-like head, and a long, luxuriant, furry tail [l]ike the flying squirrels…" (Expedition to the Demonweb Pits 110–11) and the skiurid that's described as "a shadow-born version of a squirrel, disturbingly familiar in appearance but undeniably malicious" (Monster Manual IV 126–7).

First, have I overlooked any official squirrels or squirrel-adjacent creatures? 

Second, as the DM, I'd like to recognize more squirrels. To that end, in first party, licensed, and third-party products what other squirrels exist? That is, what creatures have the actual word squirrel in their names?

Further, in first party, licensed, and third-party products, what other squirrel-adjacent creatures exist? That is, what creatures are described as being somehow squirrel-like, either because they are or are believed to be descended from, offshoots of, or otherwise somehow related to squirrels or because they are described as being like a squirrel in appearance or behavior? (This last—behavior—is a last-ditch criterion that's included only to allow an answer to expand the question's mandate if the previous criteria result in slim pickings.)

As the prestige class scarlet squirrel is a 9-level class, there's no need to go beyond squirrel and squirrel-adjacent creatures of greater than 9 Hit Dice and, for my purposes, a focus on 7 Hit Dice and below is preferred, but I don't want to artificially restrain the squirrel expert. The prestige classes legacy champion and uncanny trickster are a thing, and if some third-party source includes, like, a 25-Hit Dice squirrel kaiju, Squirrelzilla's inclusion in an answer certainly wouldn't be frowned upon.

To be clear, I'm not interested in the myriad of ways that a DM can modify squirrels with, for instance, templates or spells—I already know that such options exist and that I can use them. Instead, I'm looking for standalone new creatures. Also, for my own reasons, I'd rather not use Pathfinder material, but, again, I want to accommodate the squirrel expert, so if there's a perfect Pathfinder creature, this asker won't reject that answer out of hand.