My sister plays a tune called Groundhog that seems to be quite different to the one listed here. Apparently it's an old Jew's Harp tune. The first verse goes something like:

Groundhog, groundhog, What makes your back so brown? I've been livin' in the ground for so darn long, It's a wonder I don't (Sorry, I forget).

It goes on to have verses about a rattlesnake, a Red Bird, a Muskrat and I think a few others. It's really a great old song. I'll try to get the lyrics from her.