After Thor turned into a frog by his step-brother Loki, the frog Thor managed to lift the mjolnir, and turned into a thunder frog, but a sliver of mjolnir broke off when toothgnasher tapped it with his hook. Having found his sliver of the mystic hammer, Paddlegulp managed to lift it in attempt to fight off some rats, and turned into a thunder frog himself. It is unknown at this time, what, if any, mystical properties Frogjnolnir might have.