Swampfolk

Hillfolk are hostile NPCs encountered in the Fallout 3 add-on: Point Lookout. Physical deformities are most likely from a mixture of inbreeding and radiation. They are typically equipped with Axes, Shovels and even Double-Barrel Shotguns.

Varieties
There are three basic types of Hillfolk, including skinny types called "Scappers", as well as bigger, bulkier ones with severe physical deformities called "Trackers".

Appearances
Hillfolk appear in Point Lookout add-on for Fallout 3.

Trivia

 * Some of the Hillfolk bear a striking resemblance to humans infected with the Corprus disease from the game The Elder Scrolls III: Morrowind, another game developed by Bethesda Softworks. Both Hillfolk and humans contracted with Corprus disease will eventually develop misshapen features rather similar to the real-world disease Elephantiasis.
 * The Hillfolk bear a resemblance to the generic inbred hillbillies of horror movies, especially those of the remakes that occurred after 2002 like The Hills Have Eyes, Wrong Turn, etc.