The reason not to feed whole corn to chickens, is the possibility of of choking. Cracked corn solved that. Pop corn are smaller kernels, They should go down the hatch with no problem. If you still have apprehension, then soak the corn for a day and try feeding it then. If it is soft , or slippery it should not get stuck. I never did it but it is just an Idea.Also I had bought a ton of the bags of jiffy popcorn from the dollar store, to fill vases for the centerpieces for my daughters shower. Its regular corn kernels, the kind you use to pop on the stove top, nothing added. Can I feed it to the chickens?