Looks like some type of gourd.

Rodney

Agree - one of the many gourd varieties. Google 'gourds' for tons of info and photos.

Dave

Yep, that's a dipper gourd.

The lady that sold these to us as "musk Mellon"...haha

Sounds like she didn't do her pollination without the bees sneaking in there and causing a cross.

Definitely bottle gourd.
I dont think that this gourd can cross with musk melon or squash. Actually its seeds are WAY different from musk melon seeds and squash too.

I think the lady just got her seeds mixed up. Gourds and muskmelons can't cross pollinate because they are from two different genuses.

Rodney