Genghis Frog (1987 TV series)

Genghis Frog was a humble, naive tadpole, until he was accidentally mutated, then tricked by The Shredder to join his cohorts for evil purposes. When he saw Shredder's evil ways, Genghis realized that the Turtles were his true friends.

Also See

 * Attila the Frog
 * Napoleon Bonafrog
 * Rasputin the Mad Frog