Roley Poley. Does that have a proper spelling? NorCal.
And now that I'm thinking about it, I haven't seen of these in years. Is it because I'm further away from the ground now, or did some pesticide kill them off?
Roly poly (I'm from FL, but my mom grew up in Missouri and Maryland and that's who I would have learned the term from). I've heard other people refer to them as Pill Bugs. I've never heard anyone call them a Potato Bug.