Does Hasbro still have the naming rights for all 5? Slag's been a no-no for a while now
.Must look into that. Then again, being another reimagining of the franchise, anything and any alt-mode is possible.
They definetly still have Grimlock. Guessing they still have Swoop and Snarl. Slag, as you mentioned, is now Slug. Sludge - who knows? He's never had another toy so it's never come up.
But yeah, anything and any alt-mode is possible - sadly