Not the King! I just have grown and killed more than my share. My personal favs for any wet environment would be Dracs or many of the Angraecoids. If I were to make a list for a Vivarium with frogs I would place Dracula lotax at the top of the list. Reasons: it's small, doesn't like a lot of fertilizer (frog poop is fine), and only wants or needs low light. The bottom of the tank near a water feature or bottom of a waterfall is ideal. Even middle of tank would be fine, if above conditions exist. When the tank stabilizes at low 70s to low 60s (say 16-22C) then it will start spiking and blooming.
Most of the Aerangis/Angraecum group want high light, but do well in really wet environments. Mine are at 90-99% humidity but at 1000-1800 foot candles for 12-14 hours. They get misted every 4 hours for 5 seconds. The Dracs get the same humidity and misting but sit at 750-800 foot candles (maybe a bit less if they are shaded - something like Jewell Orchids). That's another thing - have you thought of Jewell Orchids? They are grown primarily for the colorful foliage, however I have two just about to bloom - they are in spike now. Here's a good link to peruse:
Jewel Orchids : Littlefrog Farm, Jump into Orchids!! Rob is an Orchid Board member well-known here and a frog person. Marty knows him (or of him). I have 6 Jewells in the bottom of my tank under really dismal lighting and they thrive (almost too much). He recommends them for frog environments. A couple have some pretty nice flower stalks (pinks, etc.) Hope this helps.
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Masdies, Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)