For the Frog the Bell Tolls (JP) is a Game Boy video game released in 1992 exclusively in Japan. The game name is based on the novel "For Whom the Bell Tolls" by Ernest Hemingway. The game features a typical save the princess story, though it's interesting because you're trying to save the princess before your rival kingdom does. The one who saves the princess is expected to be the more favorable one among the kingdom where the princess hails.