たらばかにじゃなかったです
たらば蟹じゃなかったです
taraba kanijanakattadesu

Noun
Desu Copula

The polite, past negative form of たらばがに

1. If it had been snow crab, it wouldn't have been.; It wasn't snow crab.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana