It's still a good idea to keep an eye on the temp. I have a Grey Tree Frog and I have both gauges in my tank. I was asking since you said that there was moisture on the top of the cage. For that to happen it usually means its pretty humid in there.

As far as the feeding question. Pesticides aren't natural either. There is no way to know for sure, but why risk it? It's safer for your pet to feed it store bought crickets and worms.