I have a frog as well, and I built it to be a safe, easy, repairable kid trainer.
Last year 2 of my boys were 6 and 10, and they both had no trouble keeping the frog in the air as long as there was not a lot of wind.
It is so beginner friendly that almost any 6 year old can fly it after a 1 minute ground school, and another minute or two of dual pilot time. Some adults can learn that quickly too.