Nooooo, far to small I'm afraid!!The smallest anyone ever has recommended for a tree frog is a 10 gallon or 12 x 12 x 18" terrarium but that's pushing it IMO and I'd recommend a 20 gal or 18" cube or if you're planting it the 18 x 18 x 24" would be better, you can have a small group in them as well. We had a debate on the forum about this not long ago.