The question is "How many days does it take for a bullfrog seedling to disappear?" 120 days. According to the official website of China Animals and Plants, the seedling stage of bullfrogs is about 5 months before the tadpoles turn into small frogs. In the seedling stage of bullfrogs, they will gradually grow and deform, and at the same time the small black spot will gradually disappear, this black spot will disappear in the first month of the bullfrog seedling stage.