While H. chrysoscelis and H. versicolor are visually indistinguishable, they can be distinguished by genetics. Well genetics have been done on these two species across much of their range in the US, and H. versicolor does not occur in Tennessee. At the top of these links, you can click on distribution map and look at the orange area where they are found, and you will see H. versicolor is absent from the entire southeast US.
Gray Tree Frog (H. versicolor) link : http://amphibiaweb.org/cgi-bin/amphib_query?rel-common_name=like&rel-family=equals&rel-ordr=equals&rel-intro_isocc=like&rel-description=like&rel-distribution=like&rel-life_history=like&rel-trends_and_threats=like&rel-relation_to_humans=like&rel-comments=like&rel-submittedby=like&max=200&orderbyaw=Family&include_synonymies=Yes&show_photos=Yes&rel-scientific_name=contains&where-scientific_name=hyla+versicolor&rel-genus=equals&where-genus=&rel-species=equals&where-species=&where-common_name=&where-subfamily=&where-family=any&where-ordr=any&rel-isocc=occurs+in&where-isocc=&rel-species_account=matchboolean&where-species_account=&rel-declinecauses=equals&where-declinecauses=&rel-iucn=equals&where-iucn=&rel-cites=equals&where-cites=&where-submittedby=
Cope's Gray Tree Frog (H. chrysoscelis) link:
http://amphibiaweb.org/cgi-bin/amphib_query?rel-common_name=like&rel-family=equals&rel-ordr=equals&rel-intro_isocc=like&rel-description=like&rel-distribution=like&rel-life_history=like&rel-trends_and_threats=like&rel-relation_to_humans=like&rel-comments=like&rel-submittedby=like&max=200&orderbyaw=Family&include_synonymies=Yes&show_photos=Yes&rel-scientific_name=contains&where-scientific_name=hyla+chrysoscelis&rel-genus=equals&where-genus=&rel-species=equals&where-species=&where-common_name=&where-subfamily=&where-family=any&where-ordr=any&rel-isocc=occurs+in&where-isocc=&rel-species_account=matchboolean&where-species_account=&rel-declinecauses=equals&where-declinecauses=&rel-iucn=equals&where-iucn=&rel-cites=equals&where-cites=&where-submittedby=
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