I agree with jack-be-little.
Maybe a kikuzo/buttercup cross? Looks large but still immature?
I bet edible!
I def don't think pattypan.
Are ornamental squash poisonous? I thought they were just bitter, not toxic. Roasting big squash like these requires a cut, and tasting like mentioned above will tell if they're bitter.
At any rate, they're gorgeous!!! I'll bet tasty when roasted, too!
USDA Zone 7b/ Sunset Zone 31