Yes, we have Gray Tree Frogs here in MI. The males call from high in the trees on humid summer days. Males have a dark grey throat while the females' are white.
Make great terrarium pets and will learn to eat from your fingers. Grow to about 2" body length. Often come to lights to hunt for bugs attracted at night.
Can change from grey to greenish depeding on surroundings and mood. Coloration blends extremely well on tree trunks.
They like to hang around my deck in and near the potted plants.
I always look forward to seeing the little guys in my yard every year.