One of the blades I have been fiddling with during the pandemic is the Marbles Swamp Master, made by Imacasa, as is the Condor Swampmaster. The project is to sharpen the back edge of the point, like the Condor.
As I read this thread, it happens that my Tram 14” bolo is right next to my chair. This one is usually in my car. It is really nimble, and easy to pick up for light cleanups. The season is upon us. A few other blades showed up here over the winter that I look forward to trying out.