They sit in the same spot all day and do nothing. You can't handle them, they often bury themselves completely and the only interaction you will have with them is feeding them and cleaning their terrarium. Decide for yourself.
No, one of the easiest frogs - keep them clean, substrate to bury in, keep them warm.
Youngsters should be fed every day or two as much as they will eat in a 15 minute sitting.
They will but don't feed mice regularly - they will help kill your frog due to dietary problems.
That is a waste on a horned frog. They need a small container with substrate and some moisture.
No, they can ingest moss and this can cause intestinal problems and lead to the death of the frog.
They need humidity - not a heck of a lot but they need it. I try to mist mine once a day so that at least some of the substrate is moist.