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.
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).
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.