First two photos are cucumbers. Cucumbers are harvested immature while the seeds are still soft. Green fruit is almost but not too late to harvest. Yellow one has completely matured and need to be removed immediately so the plant doesn't think its job is done. The seeds from the yellow fruit can be washed and dried for planting again next year, or if you live in a southern state where frost won't come until November or later, you might be able to succession plant for another crop. You might notice a Melon-like fragrance from the yellow fruit, although the flesh will be watery. Cucumber is related to melons. Sometimes you can put the mature cucumber flesh in soups and such and eat them.
It would be helpful to build a trellis in the back of the bed for the cucumbers to climb on to free up some space on the ground. I just build some for my cucumbers and melons if you want to take a look in my garden progress thread.
The finger-like leaves are watermelon. The rounded leaves in the front might be the pumpkin though at first I thought that was a cantaloupe type melon....
Weak fragile seedlings like carrots and basils might have been overwhelmed. Carrot also needs extra care to germinate sometimes. It is possible they are struggling somewhere under all those vines.
Tomatoes and peppers are typically started early indoors and direct seeding is not recommended since it takes them a long time to grow and mature.
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