In the Master System version has them, they are used as well as the slimers at the buildings. Also, the NES version has them as a threat going up the stairs. They take over the role of the Slimers in the NES version and are at the buildings. They can be sucked up when in driving mode. They would periodically merge to form a Stay Puft Marshmallow Man. Their successful migration elevated the PK energy meter.