Two of the barrels under one corner of the raft were leaking. We pulled it out of the pond with a tractor, jacked up the corner, unbolted the barrels, and paused, because we heard something.
“Wait a minute. Do you hear that? It sounds like frogs.”
I kicked a barrel loose and two Gray Tree Frogs fell on the ground. They must have climbed up onto the barrels underneath the raft.
So now I’m thinking the frog eggs in the last post belong to the Gray Tree Frog.
Curiousfarmer 
As far as frogs go, they are pretty cute.