Going off my limited experience caring for snakes over 12' in length, the only thing worse than wrestling one large, strong, hungry burm out of its cage for cleaning/feeding would be wrestling one large, strong, hungry burm out of a naturalistic enclosure set up with frogs, their insect prey, and other material commonly used to successfully keep frogs.
I'll be blunt, and no offense, but this is a horrible idea.
Fishmommy also mentioned the sanitary issue. Have you ever seen a, 8'+ burmese python drop a load? You'd be completely breaking down the enclosure every other week. That includes washing or replacing the moss and soils you use for to keep the frogs happy.
If you are down for all of that, go ahead. I think 99% of people out there would abandon the setup after a few rounds of maintenance.
I would recommend that you continue to raise the snake, and see exactly what goes into it once he starts to get some size on him. I think you'll understand at that point.
I'm going to have to agree with you there. Plus, I thought of something else. Tree frogs make noise. I'm not a big fan of noise in the house especially in the twilight hours.