From a biological point of view, this kind of creature will not exist at all, because people and animals have different chromosome numbers and different genetic genes, so it is impossible to combine them to produce man-beast monsters.
Throughout the world mythology, China's mythology mentioned half-man, half-beast gods is the most. Secondly, Greek mythology, but Greek gods are all personified, great and sanctified, so there are no half-human and half-beast among the great gods, only some unimportant gods and elves and monsters are half-human and half-beast. There are not many people and animals in form and myth, but they vary in size, which is similar to that described in China's mythology.
Liu Xiang, a subordinate of the water god, is also a snake with a human face. "Shan Hai Jing Overseas North Jing" says: "Nine faces of Liu Xiang, snake green." In the era of the Yellow Emperor, Candle dragon, the God of Zhongshan, had a son named Drum, who was also a snake. There are also two gods who are snakes with human heads. They are with Lin.
In the ancient myths and legends of China, people or gods mostly appeared in the form of human face and snake body. According to records, both Fuxi and Nu Wa were snakes with heads, and their heads could not hit the top of the hill, which led to a worldwide disaster. They are famous evil gods in the divine world. According to the West Wild Classic written by Shanhaijing, he is a snake with a head, red turtle hair, and a cruel god.
Fuxi and Nu Wa are both snakeheads. Coincidentally, there are records about heads, snakes and gods all over the world. During the Sumerian dynasty (that is, the third Ur dynasty, about 2060 BC-65438 BC+0950 BC), the fertility god Ningjizida believed by the people of Mesopotamia was an image of a snake with a head and a body.
But in any case, they are all characters in myths and legends, and they do not exist in reality, so the hydra in Malaysia will not be a species that humans have not discovered yet.