In POA it states that in there fifth year they worked it out.
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since severus snape had a doe patronus and he wasn't a marauder, then he has no nickname on the marauders map. however, the marauders did have a nickname for snape being snivellus as a mickey take on his name severus.
Moony is the codename for Remus Lupin, the werewolf, as one of the Marauders. Prongs is James Potter, referring to the fact that his Animagus is a stag. Wormtail- Peter Pettigrew, whose Animagus is a rat. Padfoot is Sirius, who turns into a huge black dog.When Harry opens the Marauders Map, the opening title reads...Messrs Moony, Wormtail, Padfoot and Prongs humbly present The Marauders Map
a beetle
"Animagus" is a portmanteau word, dropping the last letter of "animal" and overlapping the previous two with "magus", meaning "magician".
"Wizards Are Real And The Potion To It Is If You Believe Really Are One." "Or You Can Visit Your Local Book Store And Ask The Librarian If They Have A "Magic Book Of Potions" Or A "Book About Wizards"