yes, and staying hydrated will help get that junk moved through. I had one that did that. It took about 3 days then it got better.You should always give water. Chickens can go a week or more, depending on the size and age, without food, but they need water constantly. From what I've ready, even a blocked crop will allow some water through, which is better than none.
Good luck with your bird, and God Bless.