I'm new to this forum but I had a horned frog for a little over 10 years that unfortunately passed away a little over a year ago. I got him as a dorm pet and had him up till I had a kid. His housing was a live planted terrarium with philodendron and spider plants grown in river rock "gravel" that is around 1/2 inch diameter. (The surface has a mix of live moss and fiber so the frog doesn't end up interacting with or ingesting the rock) An aquarium pump filters the water/frog waste contributions to the plant roots and the water gets a 90% change every week.
I use his cage as an office terrarium to add a little life to my windowless office. I just recently got another one that lives in my office. I forgot how small the young frogs. This one is much more vocal than my last one, he sounds off every morning when I first turn on the lights.
It has been interesting reading all of the articles here and reading about the different experiences and opinions.