What's your question? Ask

It sounds like you don't have sufficient pollination or too much fruit set. If there are too many fruits on each vine, each fruit won't get enough nutrition to mature to full size. Consider limiting the nu mber of fruit on each vine. Example: the huge pumpkins that exceed 800-1000 pounds...only 1 fruit per vine, that way al energy is put into that fruit. Each variety of curcubits has it's own optimum harvest count.

This link is interesting: https://www.ipm.iastate.edu/ipm/hortnews/1996/8-23-1996/crosspol.html

This link from NCState says the same thing, but seems to be easier to understand:
http://mcdowell.ces.ncsu.edu/Cross+Pollinating+Crops/

Don't hurt him, he meant well. It would have been preferable to have left the squash on the plant until maturity, but... There is a change they will be mature enough to store. Keep a close eye on them. This article might help: https://www.gardeningknowhow.com/edible/vegetables/squash/butternut-squash-harvest.htm

Here is a link to a great article on butternut harvest: https://www.gardeningknowhow.com/edible/vegetables/squash/butternut-squash-harvest.htm

It is possible that they may have cross-pollinated, but the results would show up in the fruit from "saved" seed. There seems to be slightly more than usual oddity vegetables this summer. I've been blaming it on the weather.

While freeze-damaged fruit is still edible as long as the damaged areas are removed, its flavor may be compromised. That said, it should not pose any risk eating it should you decide to try it, but it may be best to toss it instead.