Interesting fact:

As the legend goes, Jiraiya is a ninja who uses shapeshifting magic to morph into a gigantic toad. I mean, what else would you honestly want to transform into? He was also famous for riding enormous toads and engaging in confrontations with his archnemesis, Orochimaru, a master of serpent magic. I doubt you’ll ever look at the frog-like Greninja the same again, huh?