Froggy did not originate from fanon, and more information can be found on their respective wiki(s). You may read more about it on the following wiki(s):

Froggy's appearance
Full Name Froggy
Gender Male
Family and Relations
Big the Cat (Owner)
First Appearance Sonic Adventure

Froggy is a character from the Sonic series. Froggy is Big the Cat's pet. He has caused Big to get into all sorts of trouble.


Sonic Heroes 2

Froggy makes an appearance in Sonic Heroes 2. He is a companion for Big (like Cheese for Cream) and not a character officially recognised by the game, though his antics at the beginning of the game are vital in introducing Big to Honey.