I believe they do, my girlfreind's mom said that she had tree frogs in her yard... she's in western MI. She said they were green, but I know Hyla cinerea aren't in Michigan.
It amazes me how much they can look like a green tree frog when they have their green suits on.
It amazes me even more how good they are at shifting colors to camouflage themselves.
Watching FrogTV because it is better when someone else has to maintain the enclosure!