I Didn't Know They Did This!

Here at the Holiday RV Park in Grass Lake, Michigan, the wildlife is very diverse... squirrels, chipmunks, flickers, cranes, deer, turkey... and this fellow who seems to have taken up residence in the base of a tree. Judging from the sawdust, he seems to be in the middle of a major remodeling project.

Any toad experts out there? I've never seen a toad in these kinds of digs before.