Welcome! I love the name, and love pictures of tree frog belly's! LOL! I'm jealous too of people that have frogs that just sit there on their hand or desk or whatever, but only because it would be helpful to have a frog that would cooperate with me when I need to inspect it. I'm always afraid they are going to jump away and one of the cats will get it!
Tree frogs don't necessarily need companions but if I was you I would have to get another one...or 2. I started with Shrek and Fiona and when Fiona died I was going to get one more and ended up with two more. Every time I go to a pet store I have to stop myself. There is a reptile show in Chicago in April, i've never been to one and I'm excited to go but also very afraid that I'm going to want to bring home a bunch of new kids!