I have found that squash volunteers are interesting, but of poor eating quality. The yrevert to the less tender traits of all their parents. That particular one looks to have a lot of gourd parentage. Let us know how it tastes.

You can always cook it, puree with lightly sauted onion or leek and make a lovely cold or hot soup. Even some of the rougher types taste pretty good this way--if you go for the pureed texture

Hepatica

Do squash and gourds cross ??

Gourd is a very broad term. Many ornamental squash (c. pepo) are sold as gourds. True gourds (Lagenaria siceraria) do not cross with any of the common species of squash. Also often listed as gourds are Momordica charantia (bitter gourd) , Benincasa hispida (wax gourd), Luffa cylindrica, Luffa acutangula (sponge gourds). None of these cross with other species.