In the beginning I think they produce mostly male flowers. The female flowers are the ones that produce fruit. They need to be pollinated or they die. I have gotten no squash this year on my Cushaws. I think they have to be pollinated by bees. We only have two or three honeybees if we are lucky and they are gone now. You can hand pollinate. Google it. I just never get around to it. Maybe next year.

Moles?? Are you sure they're not voles? But whatever they are I doubt they're the problem.

As Zackey says, if the flowers aren't fertilised they'll drop off.