Pruning pumpkin plants?

I have one mammoth, three sweet dumpling and one butternut squash plants that are thriving and have all set fruit. However, they're taking over! Is there a way to prune them that will prevent them taking up so much space but without hurting the plant?

 

We're into August Sterile.
I can't see where you are in the country but pumpkins and squash take a while to ripen and you could be caught out trying to ripen a load of fruit and end up with nothing.
I would cut them back to about 2 fruits at this stage. Just cut them beyond the second fruit. I would usually expect to have the fruit grown and ripening by this stage and leave 4 or 5 on the plant.
If they're your babies , space is the problem and you can't bring yourself to cut them, then wind the growths up in a circle. They will take up a lot less space. But you'll still have immature fruits if that's what you have now.
It's up to yourself. If you have more than one plant then why not cut some and leave the others and check for yourself what happens.

 

Thank you! I am off into the garden to pin them all into circles with canes :luv: The mammoth has only set one fruit so far and the squash just two but the sweet dumpling is trying to grow half a dozen - should I be brutal and only let it do three or four?

 

Well I would Sterile. Those fruits have to grow and mature before first frost. That could be in September here.