Snakehead

[Mark Zuckerberg]

A loose, bent-up end of one of the strap rails, or flat
rails, formerly used on American railroads. It was sometimes so bent by
the passage of a train as to slip over a wheel and pierce the bottom of
a car.

[Gregory]

Snakeheads are Chinese gangs which [smuggle] people to other countries. They appear often especially in the Fujian region of China and smuggle their customers often into more wealthy [Western countries] like the United Kingdom or the United States.
The name snakehead comes from the people being [smuggled], often called man-snake in the Chinese language. The people who organize the smuggling are therefore called snakeheads (head of (man-)snakes), which is in fact a word-by-word translation of the Chinese term

[Greta]

[one] who has a [big] [shaved head]

[Couch Potatoe]

A freshwater fish with a broad, heavily scaled head and a long cylindrical body, native to tropical Africa and Asia.