From Sonic Retro
It's a sphere-like robot that rides a larger sphere like machine of some sorts which releases clouds of cold air. If a character touches the cloud, he'll be momentarily frozen in a block of ice, though it gives no damage it the block will only shatter after awhile. One hit will destroy the machine, which will release the ball rider which will run away as quickly as it can, and another hit to it will destroy the badnik.
They appear only in Ice Cap, for both Sonic and Big.