So fish in minecraft like cod and salmon, when killed drop Raw Salmon or Raw Cod. However fish in Alex's Caves like lanternfish and tripodfish, drop Lanternfish and Tripodfish. Although Raw Lanternfish and Raw Tripodfish is probably a much better fit.

With that said, pufferfish is just called pufferfish, when its killed. Probably because you can't cook it.

So I'd say add Raw to the fishes that can be cooked, for consistency. Seapig you would just keep how it is, because you can't cook it.

But this isn't really a problem.