It appears similar to an american toad, however it seems to not be an identical match. We have these little guy all over the place here by the mississippi river (I'm in wisconsin), and they're usually pretty docile-I've held them and shoved cameras in their faces without any problems.

This little one hopped into a flower pot and dug around in it, much to my mothers dismay.
Anyways, I'm not very experienced with reptiles nor amphibians, so I'm not sure my tentative ID of "american toad" is correct.