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Rana pipiens
It's either a Plains Leopard frog or a Northern Leopard frog... it looks like it may have a light spot on the tympanum but I don't know if it's distinct enough to be a Plains, and my pictures aren't good enough to tell.
On the banks of the Vermillion River, southeastern South Dakota
I'd say it's Rana pipiens due to the fact that the dorsolateral fold is unbroken near the rear leg.