Does a bullfrog hibernate

Actually no, they do not. Generally tree frogs live in extremely hot conditions, where it is humid and the temperatures are high. The air is normally full of moisture too. All year around, the rainforests they live in stay at high temperatures so they do not hibernate as it never gets cold enough, and they have adapted to survive in such warm environments. Any place colder would kill them, as they wouldn't know how to hibernate and survive.