Throg dates back to Walter Simonson's run on Thor. After The disappearance of Odin, Thor and Loki were supposed to appear at a ceremony to determine who would be the next ruler of Asgard. In order to keep Thor from attending, Loki turned Thor into a frog. So Thor spent three issues helping the frogs of Central Park defeat the alligators before returning to Mjolnir, and with heroic and God like effort, managed to lift the hammer and become Throg, frog of thunder before returning to Asgard to confront Loki.