We get a lot of cross pollination in our backyard and then the seeds survive the compost pile and surprise us.
This year, we got something that appears to be a cross between a pumpkin and a zucchini.
Last year, we got something that seemed to be a cross between a pumpkin and a butternut squash. I used for all the applications I would normally use a butternut squash for and it worked quite well.
Not sure how the pumpchini will cook up, but we shall see!