Ideas on what to put in 12x12x18

[XDragonFrogX]

I was thinking some sort of reed frogs or maybe walking toads. But with the toads im concerned on the lack of length of the tank. I have a small water area with little waterfall so that take up a bit of the land area too. Any ideas of what I could put in it? I was looking I to retfs but want to be able to put more then 1 in if possible. I want to put some pythos plants in as well so there is not foliage in the tank
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[DaisyMaisy]

I like how you've set that up! How did you do the waterfall? I think reed frogs would do well in there. They do like a water feature.