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Rana catesbeiana
Lake
Yes, it does appear to be an American Bullfrog. They have become an invasive species to many places around the world. Check out this informative link:
http://www.issg.org/database/species/eco...
And let me also add my welcome to Project Noah. I hope you will continue to make such informative spottings!
I wish you had another photo of your frog shown from the side, it would be much easier to give you a for certain id. Judging from its size, I suspect this is an American Bullfrog