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There are only 2 options for actually, officially, having the “ooze” creature type in, at the very least, all of Wizards of the Coast D&D: the 5e plasmoid race, and the 3e oozemaster prestige class.

None of the other races in 5e are at all ooze-like, nor is there any way to play as a monster in this edition.

There are only 3 options for actually, officially, having the “ooze” creature type in, at the very least, all of Wizards of the Coast D&D: the 5e plasmoid race, the 5e sidekick option, and the 3e oozemaster prestige class.

None of the other races in 5e are at all ooze-like. Technically, however, you can play as a monster—such as an ooze—by playing under the sidekick rules in Tasha’s Cauldron of Everything, as detailed in @stevenjackson121’s fine answer.

Plasmoids, from Spelljammer: Adventures in Space, are the only actual honest-to-god playable ooze in D&D history, that I can find. In addition to being “amorphous” and without “internal organs of the usual sort,” their trait list outright says:

There are only 2 options for actually, officially, having the “ooze” creature type in, at the very least, all of Wizards of the Coast D&D: the 5e plasmoid race, and the 3e oozemaster prestige class.

There are a number of other options for being something “ooze-like,” all in 3e and the “v.3.5 revised edition.”

Prior to 3e, we get into TSR D&D, and I don’t know it as well. I haven’t been able to find anything, but that doesn’t mean it isn’t out there.

Plasmoids, from Spelljammer: Adventures in Space, are the only actual honest-to-god playable ooze race in D&D history, that I can find. In addition to being “amorphous” and without “internal organs of the usual sort,” their trait list outright says:

Plasmoids, from Spelljammer: Adventures in Space, are the only actual honest-to-god playable ooze in D&D history, that I can find. In addition to being “amorphous” and without “internal organs of the usual sort,” their statblock outright says:

Plasmoids, from Spelljammer: Adventures in Space, are the only actual honest-to-god playable ooze in D&D history, that I can find. In addition to being “amorphous” and without “internal organs of the usual sort,” their trait list outright says: