Corn chops is just that. Chopped corn or as often referred to as steel cut corn. It is cut into a crumble. I think in some areas it is called "cracked or crushed corn", but I can't be sure of that.
It is simply fed as with any chick feed and can be mixed with their normal ration. However, a word of caution. I made a mistake and mixed it on a 1 to 1 ratio with my feed and caused a protein deficiency in my hens. Too much corn is not good. I paid a price to learn that.