Is that a chew toy?

I've found myself sorting through Ethan's toys once again. This time, asking myself if each toy is OK to be gnawed on. I started this after I found a big chunk missing from the Nerf football. I found most of the foam Ethan had bitten off, but I think he managed to eat some. I'm also a little concerned about the electronic toys. Will the batteries give him a shock? (Would that be a bad thing?) Anyway, I'm doing this for the second time in as many weeks, and wondering what Ethan would do if I only left out one toy at a time. Hmmmmm.......