From the Super Mario Wiki
Cheesy Chesters are enemies who appear in Donkey Kong Country: Tropical Freeze. They are hunched rodents which resemble suburban rats, and they have vermilion-colored fur, indigo skin, a big violet snout, big ears, and small eyes. Cheesy Chesters appear in the Autumn Heights world, and are usually encountered in subterranean areas with cheese, such as Crumble Cavern and Rodent Ruckus.
Cheesy Chesters have some anthropomorphic characteristics as shown from their ability to be bipedal, by only walking on only their back feet while swaying their front feet like arms. When a Cheesy Chester notices the Kongs, it starts walking on all fours and charges at them. If the Kongs get in contact with a Cheesy Chester, they lose a heart point. The Kongs can defeat these enemies by a jump attack, rolling attack, throwing a barrel at them, or by charging into them with Rambi. If Donkey Kong performs a Ground Pound near a Cheesy Chester, the enemy gets stunned, which causes it to sit down and rock back and forth dizzily.
A few Cheesy Chesters appear in the brief introduction cutscene of Windmill Hills, and each one does something different: one Cheesy Chester is chopping wood, another is holding out a stick with a few bananas to a Schnautzel, and a third one is simply facing the screen.
In Rodent Ruckus, Cheesy Chesters are seen exploiting the mine and extracting the cheese from within the ores, using simple mechanisms consisting of ropes and beams.