I've thought about darts only because they're diurnal, where tree frogs are typically strictly nocturnal. My gray tree frogs will wake up for feeding, but otherwise don't move during the day, some won't even wake for feeding during the day, they have to be fed at night.

Yet I prefer being able to use more diverse and easily available food for the tree frogs. I hate having fruit fly cultures, and the worry of one crashing and where I'll get an emergency one if that happens. I have not gone into dart territory because of that, and only because of that. When I had spring peeper froglets, there were times I would end up calling around and waiting for responses because I had a failed fruit fly culture. With the tree frogs, I can use crickets, meal worms, roaches, and in a pinch, wax worms from the bait shop near my house. They don't like the wax worms as much, but they will eat them. Some tree frogs will even eat worms...not mine, but I haven't pushed it.

Darts are colorful and more active, but tree frogs can be beautiful too.

You could just start with one and eventually get another