We gift each other our small garden produce, I was just gifted this and she said it's "a cucumber, but it's not ripe yet". This looks nothing like the cucumbers I'm used to, and they're eaten mostly green. Tapping on it, it sounds like a gourd (like there's a hollow inside).

Any ideas what are these? I'm guessing it will pair well with the sponge gourd and okra they've given.