あまがえるじゃなかったです
雨蛙じゃなかったです
amagaerujanakattadesu

Noun
Desu Copula

The polite, past negative form of あまがえる

1. Was not a tree frog.; Wasn't a rain frog.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana