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Cauliflower is a popular substitute for mashed potatoes ("fauxtatoes").

There is also a retail-available cauliflower frozen pizza brand at Sprouts -- both pizzas and crusts-only for homemade pizzas.

I bought a personal pizza at the grocery store with a substitute crust made of chicken meat. It was awful. I think it was something like this: https://www.realgoodfoods.com/product/mixedcases/

I assumed that the crust would be more bread-like, but somehow made with some chicken meat. It was more like a flavorless thick circular slice of chicken breast with pizza toppings.

Shrimp pasta (made by making dough out ground up shrimp mixed with transglutamate) was a thing in foodie circles for a while (personally I never tried it).

Google “fathead dough” :)