Helith posted:

Very confused Brit here, what the hell made you associate jam roly-poly with seafood? Jam roly-poly is a desert made of a layer of sponge cake with a layer of jam, rolled up and usually eaten with ice cream or custard.
I feel like I’m missing some key context here as I don’t know what a pillbug is.

e: some googling later and a pillbug is what I would call a woodlouse which is a land crustacean. Pillbugs are a US variant and can be known as roly-polies! Very clever!