I saw this guy in the pond today. He is the largest frog I have ever seen. I know it's hard to tell from the photo, but his arms are the size around of my fingers and he himself is the size of a salad plate. I don't want him to eat my fish, and I think he might be able to. Eek!  I think it's a bullfrog. All my other froggies are green frogs.

OK this is a better picture to show the hugeness. On the upper right lily pad there is a frog that I would consider to be a medium-to-large frog that we've been seeing in the pond. The monster on the left is the bullfrog.