I think those are Squashbugs eggs.
I use neem oil for them, as well as handpicking. I've found that if I take our sprayer out there, and give the plants a good spray down, especially at the base, they will come crawling right up the stalks, and you can just pluck them off. They stink if you crush them, so I just toss them in the soap water cup. It's very effective. If you see those eggs on the top or bottom of the leaves, there ARE adults either on that plant, or close to it. They love hanging out at the base of the plant,( where they mate constantly it seems like!!! UGH!) and if you turn the plant over slightly, you can usually find them. I'm not having MUCH trouble with them this year, which is very unlike every other year. Maybe my controls are finally paying off? Idk....but I'm enjoying it. They are the worst pest I have, normally!
Leaffooted bugs don't normally host on squash and zucchini. At least not here they don't. They do hang on the Cukes though. I normally find their eggs on tomato foliage. Same with stink bugs... Not discounting them, the eggs look really similar, but I think those are Squashbugs... (Get ready to pull your hair out controlling them!)