Potter, Black, Lupin and Pettigrew is the correct answer. The Marauder's Map was created by James Potter (Prongs), Sirius Black (Padfoot), Remus Lupin (Moony), and Peter Pettigrew (Wormtail) during their time at Hogwarts. They used their nicknames derived from their animal forms. Fred and George Weasley later found it, not created it.