Get all the squash & Zuks out. They probably won't transplant well, but they grow fast, so you can start over from seed in another bed.

If you can find the cucumber among the squash, put up a trellis and run it up.

Yeah transplanting at this stage would be pretty much a lost cause but it would be easy to direct seed squash somewhere else and give everything else here a better chance at survival.

1 squash plant can easily take up a whole bed that size unless you go to some of the 'bush' varieties.

Dave

Ha ha! Yeah a bed that size maybe should only have 3 tomato plants (and they'll need a cage or some kind of support) possibly some herbs like basil companion planted with them. Would make a second bed for your cucumber & peppers to share (provide a trellis or tomato cafe for the cucumbers to climb on. Onions aren't a great companion plant for most things so would give them their own bed- garlic and onion can share a bed. Squash gets huge- I've seen zucchini & other summer squash just 1 plant get maybe 10 feet in diameter? Might not bother with a raised bed for that just plant in a mound of compost and give it room to sprawl (FYI same goes for melons & pumpkins). You can always try transplanting & see how it goes- if they don't survive at least you tried- and if you are gentle they may be fine. Next time pay attention to plant space requirements or do a little research first. At least your plants look healthy! Good luck!