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.
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James Potter's (Harry's father) nickname is Prongs because of his Animagus, the stag.
a beetle
"Animagus" is a portmanteau word, dropping the last letter of "animal" and overlapping the previous two with "magus", meaning "magician".
"More or less human", playing at the fact he's an animagus.
He could turn into a stag.