A green frog-like mutant who can dissolve into slime and return to normal as well as spew acid-like liquid from its mouth. He hated being called "Frogger" by Ryan, because as he said, he does not "hop across roads and rivers to avoid alligators and cars just to get home", and then added that he can go home anytime he wants to before making a snide comment about Ryan's father being unable to get home, they then began to battle after Ryan demanded to know what Amphibidor knew about his father and the monster replied that Grimlord had "special plans" for him, foreshadowing the Quest for Power series. His most prominent episode was Season 2's opener, "Mutant Mutiny", where he planned to start a revolution against Grimlord, but failed when Grimlord found out, in which the aforementioned dialogue took place. To prove himself loyal to Grimlord, Amphibidor fought Dream Master and used his slime-dissolving ability which caused Dream Master to surrender. Amphibidor fought Ryan and eventually damaged his armor. Despite interference from Ballistix and Cannon Nose, Amphibidor was eventually defeated by Ryan's "Lightning Hand" command right before Ryan called him "Frogger" once more just to taunt him while on the ground from the finisher as Amphibidor spewed the liquid all over himself before he exploded right after the usual "see-ya" he said "Looks like it wasn't cars or alligators that kept you from going home, Frogger". Grimlord informed his warriors to let Amphibidor's fate be a warning to anyone who tries to strike out against Grimlord. Amphibidor fits the category of Toxoid's army.
- The "Frogger" references were removed after the first few airings of this episode, likely due to a possible lawsuit from Parker Bros.
- This marks one of the few times that Grimlord is pleased with the outcome at the end of the episode, as he wanted to destroy Amphibador, but decided to let him battle Ryan instead since regardless of the outcome, he would get what he wanted.