The swamper's name is Candy (Chapter 2).
A swamper is a man whose job it is to keep the bunkhouse cleaned out. Candy is old and crippled, and can do little more at this point than the unskilled labor he is assigned to do. He has a filthy, aged, lame dog whom he loves dearly. The other men in the bunkhouse, annoyed by the dog's smell, encourage Candy to euthanize him. They argue that the dog is no good to anyone and is in pain, and that the merciful thing to do would be to put him out of his misery.
Candy knows that he himself is deteriorating with age and sickness, and that he will soon be unable to perform his duties as the swamper. He fears that, like his dog, he will be deemed expendable at that point, and banished from the safety and security of the ranch. He does have a little money put away, however, and hopes to be included in George's and Lenny's dream of owning a place of their own (Chapter 3).
Candy. He is a swamper .