This mecha paper model is Uncle Chewy (Candy Person 102), one of the Candy Zombies that Princess Bubblegum and Finn raise from the dead in "Slumber Party Panic", based on the American animated television series Adventure Time, the papercraft is created by WebDude.
Uncle Chewy is a cylindrical blue-green Candy Person with light-blue frosting as his head. He has two teeth sticking out of his mouth when it is open. He has chocolate cubes sticking out of the frosting on top of his head and on his body, which are aligned to look like buttons. For more information please click here.
You can download the papercraft template here: Adventure Time - Uncle Chewy (Candy Person 102) Free Papercraft Download