The Prince of the Sablé Kingdom (referred to as Sabure Prince in Super Smash Bros. Brawl) is the protagonist in the Japan-only Game Boy game, For the Frog the Bell Tolls. He has no official name, since he is named by the player in the beginning of the game.
The Prince of Sablé is a new Assist Trophy in Super Smash Bros. for Nintendo 3DS and Wii U. He transforms into a snake or a frog and unloads multiple attacks on any opponent he catches. He was revealed in a Pic of the Day along with his Trophy. The Frog can jump, but the Snake can't.
A naive but kind prince in the Game Boy title Kaeru no Tame ni Kane wa Naru. He sets off on a journey to the Mille-Feuille Kingdom to resue the kidnapped Princess Tiramisu. If you summon him in this game, he'll either turn into either a frog or a snake. When a foe gets close, he'll kick up a cloud of white smoke and go on the offensive.