Rock Roller
Rock Roller is one of the elusive “Shock Rocks” Rock Lords, alongside Rock Shot and Stone Hook. These were released towards the end of the line, and are a bit harder to find.
In rock form, Rock Roller is a big blue rock. No idea what kind of rock it could be, maybe some kind of turquoise?
Each of the Shock Rocks has an action feature. Rock Roller has a friction wheel on the bottom, you can rev it up and launch it across any hard surface.
In robot form he’s basically by spirit animal. He looks how I feel pretty much all of the time. Plus, he’s fat, with legs that barely hold him upright. The leg joints are super loose.
I don’t think Rock Roller ever saw release in Japan, although it was likely designed by Bandai for Tonka.