Source: Source: Harry potter fans, did you guys know all this? Well, all that was nothing but a clever trick by the filmmakers.
The Marauder's Map, which Harry uses to see where people are moving around Hogwarts, shows two pairs of feet in a rather inconspicuous position in the bottom left corner.
Additionally, it was never mentioned who the Marauders were or who the nicknames Moony, Wormtail, Padfoot, and Prongs referred to.