Thank u Eli! They are so fast for me to tell but i do know they are smaller than a dime or almost the size. One got out yesterday when i misted their hab and I was so afraid to hurt it when catching it. They actually look bigger in the pics. The plants are small & those are close ups. I just googled grey tree frogs and i think your right. I just assumed they were green tree frogs because they are common and green once they morph.