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Rana clamitans
Pond in Maine
It's a toss-up between American bullfrog and green frog (Rana clamitans). I'm leaning toward green frog due to the dorsolateral fold that runs over the top of the tympanum. It appears to run over it and then starts down the back toward the rear leg. Bullfrogs simply have it over the tympanum and that's where it ends.