Curious George's friend Bill has put him in charge of several tadpoles. George sends the tadpoles for a nice swim in the lagoon, but to his dismay, the tadpoles don't return! Each time he goes back to the lake he tries to find the tadpoles, but he finds only tadpole-like creatures without tails . . . and with legs. A trip to the museum teaches George about the development of tadpoles into frogs, and he and Bill are happy to make the acquaintance of their new froggy friends!