If a column or support is shaped like a man it’s an Atlantid. If it’s a female it’s a Caryatid.
What if anything if it’s an animal?
Interesting question, although I don’t think I’ve ever seen a non-human being used as a support column or pilaster. I wouldn’t put it past Gaudi to have used one, but none come to mind. Non-human beings are used for gargoyles, of course, but that’s not the same thing, having no actual or implied structural component.
On the other hand, if you can tell if the animal is male or female, you could still use either atlantid/telamon or caryatid I suppose.
Louis XV style, actually, although that’s for furniture only and not architecture. AFAIK, Gaudí never did it. I’ve seen many chapitels shaped like animals or esculpted with figures of animals, but never the trunk of the column.