かんてんだこじゃなかったです
寒天蛸じゃなかったです
kantendakojanakattadesu

Noun
Desu Copula

The polite, past negative form of かんてんだこ

1. Wasn't a kelp octopus.; Wasn't a cold-weather octopus.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana