Vegetable that resembles non-vegetable? Resemble is a tricky word. I’d say more No than Yes as the word is typically used, but—stretching the meaning of resemble to its broader senses—you could plausibly say Yes.

As a ps to my answer to Tuj, the absence of a fixed location in general is certainly useful information as well.

Mask? No.

One word? No. The AOTC as written is four words including the definite article, but I will accept any suitable identifying phrase.

Is it alive? No. But be careful about your assumptions.
Associated with a particular season? No. * a certain tension in the air intimates that the audience almost wants to applaud but knows it shouldn’t*
Legible? No.

Does it exist today? No.

Fictional? No.

>1? No. (You already know it is unique.)

Connected to a celebration? *considerable audience laughter*. I think I have to say No, though some might argue the point.
Relevant to archaeology? No.
Vegetable part edible? Yes. (And remember the whole thing is vegetable, not just part of it.)
Was it art? *more laughter* Not in the conventional sense, No.

After your good start I am surprised this is taking so long. As a hint, you could always explore the animal connection further.