I miss Fred

He has George's ear to keep him company

Also, it only works when they're at hogwarts and I'm pretty sure they value their pranks and snack sneaking above checking in on ton while he sleeps

No, because he was in his animagi form, and only people who knew about their animagus would see them on the map. The marauders made are of that

Wouldn't his name show up as Wormtail though and not Peter Pettigrew?

Yeah, me too