Why is Lin Chong nicknamed "Leopard Head"?

I remember when I was in college, it seemed that someone had studied their nicknames. I don't remember the details clearly. Let me give you some clues. Fortunately, this is still inconclusive. Lin Chong is not a historical figure, but a fiction. There seems to be a book called The Legend of the Great Song Dynasty, which only mentions that Sung River in Shandong had only 36 leopard heads. It should be said from the image and customs. First of all, Lin Chong's image is indeed like this. You can read the original water margin, but the description is somewhat inconsistent, which is also the reason why Zhang Fei's image is not similar. Therefore, it is more likely to be social habits. At that time, there were precedents for giving yourself a good name, such as mother worms and vegetable gardens. Some of them strengthen the rendering of the characters to make them more prominent, while others make up for the shortcomings and make them look powerful. However, according to Lin Chong's status and martial arts, it seems unnecessary to do so, so it should be provided by others according to the image, which is a name imposed by society. For example, many people have been called many times today, and some do not match. I remember that there seemed to be a master named Yang who had read a study on the names of characters in Water Margin. It seems to be a book published by Shanghai Ancient Books Publishing House, about 80 years ago. The article by Mr. Yang is the origin of the names of Zhu Gui, Lin Chong, Guan Sheng and Chai Jin. Because I haven't touched this for five years, I can only rely on memories to provide some clues. You can search online forums yourself. I don't think there are any works by Mr. Lao Yang. Regarding whether the word "head" is a coach or a human head, I think it should be associated with the leopard to take a complete meaning of the leopard head, because every time a word with coaching meaning is added after the leopard, there is something wrong with the leopard coach. The human head is not suitable either. Nicknames and titles are generally used to highlight or make up for his character. For example, although there are tattoos and embroidery, it mainly highlights that his character is incompatible with monks, and the short-legged tiger makes up for the lack of appearance. Of course, this is just people now. My guess is that it is quite possible that Wang Ying was given this nickname at that time, not to make up for this deficiency.