They can chew it, but I would crack it JIK, but straight corn can cause some issues with their poo. It loosens it up for some reason makes it like cow pies not nice goat berries. As a treat its ok tho.
Mabey someday I will have these critters all figured out. Then I can write an instruction manual.
If they didn't eat very much of it they should be fine--I let mine eat dried corn right off the cob sometimes...but I usually break the ear in half and give a half ear to each goat. Mine have never gotten diarrhea or a belly ache from that amount.