See all those holes in the thick white foam in the first photo? Those were made by rising brook trout and creek chubs. Mostly creek chubs. I caught four chubbies and one brookie, and the brookie didn't let me get a photo.
The only places that held fish in that stretch of water also had huge amounts of foam. Just goes to show that the old saying, foam is home, is definitely something to pay attention to, especially on small streams. Run a small wet fly or streamer under the foam and chances are something hungry will come up for a look.