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Lithobates palustris
Breeds in shallow waters
Forests, sandy places, and fields.
I think this may be a Pickerel Frog:
http://wwwnew.towson.edu/herpetology/amp...
http://www.dnr.state.md.us/wildlife/Plan...
Looks like Southern Leopard Frog (Rana sphenocephala).
The only other frog that looks similar is the Pickerel Frog, i would check both out since you are the Spotter and therefore the expert!