Hong or jiang is a Chinese dragon with two heads on each end in Chinese mythology, comparable with rainbow serpent legends in various cultures and mythologies.
Warring States period jade pendant with two dragon heads
Tomb painting of Nüwa and Fuxi excavated in Xinjiang.
Jiaolong or jiao is a dragon in Chinese mythology, often defined as a "scaled dragon"; it is hornless according to certain scholars and said to be aquatic or river-dwelling. It may have referred to a species of crocodile.
Nüwa and Fuxi. Tomb painting excavated in Xinjiang.