I raise ramshorn snails (the Dr. Doolittle style pink ones). I am always looking around my tank for what you're showing -- these are definitely ramshorn eggs. If you scrape them off, they won't hatch. I don't consider these pests. They are fantastic for planted tanks, if you do have pink or blue ones, they're especially gorgeous. If they get big and you don't like them, pull them out. IME they don't blow up in population like pond, bladder, or MTS, and keep in mind I'm someone ENCOURAGING them to populate. You can just get rid of them fairly quickly with mechanical (finger) removal. If you ask a little kid to draw a snail, what they draw is a ramshorn. You can't beat a classic.
A little one probably came in on a plant, and laid the eggs. You probably have quite a few that came in, they can breed when they are TINY, and you've got a "nursery" full of egg baskets there.
I'd say ramshorn as well. I have all the snails (not really just bladder, ramshorn, MTS and a mystery snail-I like snails), and those look like ramshorn. Bladder snails also lay their eggs in a gel-like blob but this is often in a crescent shape.