Originally posted by retsam1:

This is a pretty niche want to be honest. The physics of objects currently in game is limited for such wants so you'd either have to use items already in game like a short cut log or something you roll like that or a wild creature.

Honestly, it would be kind of fun if you could turn one of those oak logs into a ball. I'd probably settle for rolling it down a mountain, but you probably could build sort of a wooden rollercoaster for it down a mountain.