There are around 24,000 high schools in the US. I'll take that number as a proxy for the number of football fields, because, while some high schools don't have one, there are also quite a few which are affiliated with college/universities or municipalities.

So that's about six cubic yards per football field, or about enough to fill a couple of standard freezer sections at a supermarket.

We can conclude from this that football players don't eat fish sticks very often, or there wouldn't be any left for anyone else!