Gray Tree Frog

There are no ways to tell Gray vs. Cope's Gray. Visually they are both highly variable and can't be told apart. Supposedly the only way to tell them apart is by their call, one is faster than the other, but that is only true if they are calling from the same temperature, and there is no way of knowing if two frogs calling are the same temperature, and all frogs calls vary depending on the temperature of the frog. So it does not matter whether you call it Gray or Cope's Gray, there is no way to tell which one it actually is unless you count its chromosome number.

Gray Treefrog vs Cope's Gray Treefrog http://mdc.mo.gov/discover-nature/field-guide/gray-treefrog-and-copes-gray-treefrog

They are very loud! So much fun to have them crawl on you though, I love their sticky toes :)