Sure!
Some of the Thumbnail species (Ranitomeya). That could probably house a pair or trio of most of those species. Maybe a pair of R. imitators? Or a trio of R. ventrimaculatus or R. sirensis or a similar species.
By the way, i'm extremely jealous that you're so close to Microcosm. I really wanted to go but I couldn't justify paying for a plane ticket just to go spend more money at a "frog show". Hahah
~Alex