20 minutes. According to the detailed description of the tree frog skin recipe, the tree frog skin needs to be cooked for 20 minutes on medium heat. When cooking frogs, it is best to cut the tree frog into small pieces, heat it to maturity at high temperature, kill bacteria, microorganisms and parasites before eating it, so as not to affect the body. Eating tree frog in moderation is good for supplementing nutrition, promoting gastrointestinal digestion and improving appetite.