Lost bright green pet tree frog named Hoppy near Bitterroot River in Missoula.

I lost my pet tree frog, named Hoppy, while taking a stroll along the Bitterroot River in Missoula. He slipped from my hands while I was trying to get a better look at him, and I couldn't find him afterward. He has bright green skin and is about 3 inches long. If anyone finds him, please let me know; he means a lot to me!