I think dart frogs would make a great addition. One thing to take into consideration is the size of the plants, and the age of your frogs. I have heard of young frogs becoming trapped in large pitcher plants, however, from my understanding this is rare. Otherwise carnivorous plants and dart frogs frequently thrive together. I would recommend researching the species you plan to use in advance, auratus, and leucs make hardy captives and would be a good choice. Depending on the number of frogs I would recommend that you start with 20 gal. I keep three green and black dart frogs in a 40 gal breeder (this is a very large tank for just 4 frogs but it looks great.)
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2.2.9 Crested Geckos
0.1 packman frog
1.1.1 Box Turtles
3 green and black auratus