Land of the Lost Jewels (1950)

Two children are fishing when they catch a talking fish named Red Lantern. He takes them underwater with him to the Land of the Lost, where missing items can be found again. They meet King Find All, a walrus, and a singing cricket (Hoppy-Go-Lucky) that used to be the girl's pin. He's deemed to be a special jewel (since he's made of emerald) and is brought to the jewel storage room, despite his wishes to be in the Land of the Toys...