In reality, Swamp Girls are more demure exotics, maybe not quite dressed for Mass but maybe for a hamburger stand or taking pictures with tourists (and the Swamp Monster, if available.) These are typically college students who adopt the persona and accent to go with the show.
Hardly savage, do you think?
That wouldn't sell pulp magazines in the 1950's, would it? This might:
This might serve to depict her as a strange, fairy-like creature in a hyperromanticism of reality: