There are a lot of places on line to get small, colorful plants that are suitable for tropical vivariuims with frogs. Do your search under "terrarium plants," and you'll come up with several sources. There are many small ferns, Pileas, Peperomias, Pellionias, creeping ficus, ivies, Fittonias, Selaginella, mosses, as well as bromeliads for the background that do very well in small habitats without becoming too large. You will always need to do some trimming of the enthusiastic ones, of course. I personally avoid the big stuff like the Pothos and Philodendrons, just because the leaves are too big and they grow too fast in general. Think small when you plant. It's a miniature replica of a rain forest, not a big real one.
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Patty
Pahsimeroi, Idaho
4 D. auratus blue
5 D. galactonotus pumpkin orange splash back
5 D. imitator
6 D. leucomelas
4 D. pumilio Bastimentos
4 D. fantasticus
4 P. terribilis
4 D. reticulatus
4 D. castaneoticus
2 D. azureus
4 P vittatus