[I had to do a new post for this, because if I added pics to the previous one, it'd screw up all the formatting, and I don't have the time (or patience) to fix it right now.]
I just checked the bubble globs on the grass. Here's what I found.
Each one had at least one of these little critters in it.
They must really mature FAST, because I found nothing but a tiny 'something' that was indistinguishable in any of the bubble globs this morning. Now they all have these larvae in them. This last one had three!
I still don't know what they are.
The answer: Grandpa called his crop consultant, and he said they are Meadow Spittlebugs. How aptly named, huh? Now we all know.
A photo of a mature one can be found here, and there's some information about them here.