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Lithobates pipiens
The pickerel frog was on my short list for this spotting, but based on what I read on the link I provided in the ID suggestion, I still feel pretty good about northern leopard frog. Here's what the site says about the two:
"The pickerel frog is quite similar to the northern leopard frog. The main feature distinguishing the two species is the shape of the spots. The pickerel frog has square spots, usually in rows, and the leopard has round spots in a more random pattern. The leopard frog may be either green or brown."