I couldn't sleep one night and decided to make jokes up. Interestingly enough, they are all about snow men...
What do you call a snowman that steals your identity?
A snow fake
What do you call your snowman friend who always bails on plans?
A snow flake
This one is a stretch...
What did Wendy name her snowman?
Frosty (Like Wendy's fast food chain... Frosty?)
Use at your own risk.