kaeru no tame ni kane wa naru
A comedic action adventure RPG for the Game Boy, released by Nintendo in 1992. Rivals Prince of Sablé and Prince Richard are on a race to save the Mille-Feuille Kingdom and its princess Tiramisu from King Delarin, while the kingdom's people are turned into frogs.
The game was not released outside Japan, but it would continue to be referenced in future Nintendo games like The Legend of Zelda: Link's Awakening and the Super Smash Bros. series.