There are several color morphs within in many frog species, but the only one that I am aware of sometimes having a mid dorsal stripe that kind of looks like this is the wood frog (Rana sylvatica). Are there dark patches behind the eyes of this frog? See http://herpnet.net/Minnesota-Herpetology/index.php?option=com_content&view=article&id=55:wood-frog-rana-sylvatica&catid=41:minnesota-frogs-toads-and-treefrogs&Itemid=63
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