The humidity requirements for darts are way too high for tree frogs to tolerate as a normal routine. Tree frogs require a lot of ventilation and that much ventilation would kill the darts.
Another point I didn't even think of. Strike my last comment, Cheri's absolutely right. XD;
0.0.2 Litoria caerulea
--------------------------------------
"The gallows are no place for the stubborn//Just you and your lover as a dark souvenir" - Bad Books, Pytor