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. I have an orchard on my property and in the fall, the chickens run there first thing in the morning. Never had a chicken drop dead under an apple tree.
I don't know about hen eggs but squirrels DO eat bird eggs. My parents had two bird houses that they loved to watch the nesting birds, babies and then them fly away.One side was fixed so you could open it and see the babies thru a plex-glass wall.. don't know about hen eggs but squirrels DO eat bird eggs. My parents had two bird houses that they loved to watch the nesting birds, babies and then them fly away.