Name that Fruit

I have written before about using seed from store-bought Delicata squash. The issue is that unless you grow homogeneous crops with hundreds of yards of separation between crops, you will get cross-pollination. That won't hurt the parent plant or its fruit, but the progeny of cross-pollinated fruit will be unpredictable. The old wives' tale is that the progeny fruit will be inferior to the parent fruit. I believe this is wrong. I used tainted Delicata seed last year and had success. It admittedly was unpredictable, as I got plants that produced dumpling squash or Delicata. But the flavor was undiminished in either variety.

I used the Delicata seed again this year and, so far, have impressive vegetative growth and a lot of fruit ripening on the vines of several plants. I again have Delicata and dumpling (which has some fruit as large as an acorn squash), but I also have one plant that is producing something quite odd. It looks like a watermelon, so it likely will get nicked. It will be interesting to see what the final result looks like and how it tastes.

What is it?

Dumpling squash.

Delicata squash.