It goes by different names in different places.
Here we have three products that all fall under the heading of scratch:
Scratch grains - this is cracked corn, oats, some seeds.
Chops - this is strictly cracked corn
Scratch - this is finely ground corn, looks just like corn meal. I accidently bought this last winter when I meant to buy chops. I experimented and found that my chickens loved it as a cold evenings treat when I mixed it with warm water.
I don't give mine any form of scratch during the dog days of summer. Right now, since it's cooled off a bit I'm giving them scratch grains. Come winter I'll switch to scratch. I rarely buy chops.