Edible loofah. If you let them mature on the vine you can make bath loofahs...I prefer them on the dinner plate. Zucchini has proven challenging for me to grow, so rather than heading for the pesticides I've decided to try alternative plants that are heat and humidity friendly.
Their taste is somewhat like that of a zucchini but grassier/fresher. It can be used in the exact same way as any veg in the zucchini family.
If you are planning on trying these I'd highly recommend a strong trellis or some kind of support. These vines grow extremely large!