[url=http://vignette1.wikia.nocookie.net/fallout/images/5/54/Swampfolk.png/revision/latest?cb=20150404232110]Not quite, but very close.[/url]

The Swampfolk had tumors and growths, yes, but not to the extent that these mutants have. These things are roughly similar to what would happen if you stretched a Wanamingo's skeletal structure to fit a human body and then gave them a healthy dose of brick-shithouse muscles.