Crook Neck Squash
I have lots of squash but they only get about 2 to 3 inches and then they look like they are dried out.
Certified GKH Gardening Expert
Generally, this is due to poor pollination. Squash will produce fruits even if no pollination has occurred, but they will only grow to only a few inches and then die. This can easily be corrected by growing bright-colored flowers (like marigolds or zinnias) close by to entice bees to the area. You could also hand pollinate them. These articles should help:
Too much fruit set can also lead to small fruit size as well. In addition, a lack of water can decrease the size of your squash.