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.
Making the world better, one answer at a time. Anything that can be food for a human can be food for a chicken. Chickens can eat plums. Keep in mind that they have preferences just like us. Just because they can eat them does not mean they will eat them.