We’ve started calling Tom Cullen “Tommy”, which I suppose is just a natural progression. Sugarbutt is occasionally “Shoogie”, but most of the time he’s just Sugarbutt.
I’m sure their permanent nicknames won’t show up for another 6 months or so.
“Hey, Bob! BOB! What? Okay, whatever, ROBERT, come over here and smell this! I AM ROTTEN!”