What do you know about the origin of the three-legged golden toad?

The three-legged golden toad is a three-legged a toad. Then. He is different from the others because it spits money. Legend has it that she was a demonic spirit. Later he was subdued by Immortal Liu Hai and reformed, he went around to help those poor people to spit money to others, and then it was taken as a kind of prosperous wealth and auspicious beast. So people like to put some three-legged golden toads in their homes