I truly have no idea what is causing those boils which is why is suggested for BDB to try and post the video on the forum.

I've never seen similar activity like that from bugs in Western PA, but it could easily be some kind of insect who's population has exploded due to no predators being present in the water.

However, the boils seem pretty big for some kind of insect or mud-dog type creature.

I have seen the activity of bullfrog tadpoles in ponds, but to my recollection, it didn't ever seem like what BDB has going on.

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."