Nice array of stopper and lanyard knots! Keep up the good work!
I first saw what was called a Bowline Stopper Knot in The Outdoor Knots Book, by Clyde Soles, The Mountaineers Books, 2004. {By the way, if you do a Google search for “bowline stopper knot”, you get a ton of ways climbers add a safety knot to the free end of a Bowline to prevent it from slipping out.} Both Randy Penn (in The Everything Knots Book, 2004 and Mark Gomers (some time in the IGKT forum), mentioned the close connection between the Ashley Stopper Knot [#526] and a Bowline. In your first panel, your Bowline Stopper looks like this. Pull the collar down through the nipping loop, and you get an Ashley Stopper.
If instead you pull the free end forward as you form a stopper knot from a Bowline, you get a different knot. Pulling the collar down through the nipping loop here gives one of many False Ashley Stopper Knots.
Doing the same procedure with a Cowboy Bowline leads to another False Ashley Stopper Knot.
