Comics set in swamps

fictional character, is a humanoid/plant creature elemental in the DC Comics Universe

fictional character, a zombie supervillain in the DC Comics Universe

American comic strip

The Man-Thing (Dr. Theodore "Ted" Sallis) is a fictional character appearing in American comic books published by Marvel Comics. Created by writers Stan Lee, Roy Thomas, and Gerry Conway and artist Gray Morrow, the character first appeared in Savage Tales #1 (May 1971), and went on to be featured in various titles and in his own series, including Adventure into Fear. Steve Gerber's 39-issue run on the series is considered to be a cult classic.