On Monday I asked:

What's going on here?

Diane came the closest: “Parasitoid wasp eggs on a Hornworm."

I think they are wasp cocoons, not eggs.  Congrats, Diane! (I had originally said they were larvae).

More on the wasps here:

https://www.thedailygarden.us/garden-word-of-the-day/parasitic-wasps