蝦夷 えぞ赤蛙 あかがえるではありませんでした
ezoakagaerudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 蝦夷赤蛙

1. Was not a Hokkaido frog.; Was not a Ezo frog.

Past/Perfective
Negative
Polite
Formal Register