The definition and abbreviation for Potentially Hazardous Food (Time/Temperature Control for Safety Food) or PHF/TCS should be modified to drop the reference to potentially hazardous food and PHF.
Yes, as a treat apples are fine for chickens. Some will say it is best not to feed them too many apples as the seed of an apple has a small amount of arsenic in it.
Chickens are omnivores. They eat seeds, but they can also eat worms. human beings are also omnivores, although some people choose not to eat meat. These people are called vegetarians. The chimpanzee is omnivorous. It eats fruits, leaves, palm nuts, seeds and stems, as well as ants, birds' eggs, fish and termites.