Otis - Old man, Little Buddy, Mutt

Digger - Hog, Hog Dog, etc., Digs

Chubby - Chubs, The Chubster, ChubChub

Prince - Whitefox, Baby, Princey

Puppers

Soda - Meanie, Clown

Cracker - Cracker-girl, shy girl, Sweetie

Birdie-butts

They all have so many, so I just listed some off the top of my head.