Yup. I've had them gnaw on pretty much everything - bowls, tubs, racks, etc. Even had one chew on itself when it missed a mouse.

My favorite hog was one that had some serious mental birth defects. She absolutely refused to attempt eating anything but my hand, so I'd have to let her start on a finger and then shove a pinkie in the side to swap them. She died last year - not sure how I would've gotten her to eat as an adult, because I'm sure not about to let a big female chew on my hand. LOL