What kind of substrate are you guys currently using for your whites tree frog? I am looking for alternative because the substrate is kinda messy as Marshi tends to climb around the tank and I see nothing buy dirt. Any suggestion?

YouTube - White's Tree Frogs eating Locusts

I pulled this video out from youtube because this owner did not use a substrate, do you guys think this will work for the whites tree frog and if so, what kind of material is this??