Big Bee Rotary Cutter is your answer. I don't know much about them other than this is their heavy duty version.
The correct term for all of these mowers regardless of brand name is "rotary cutter" or "rotary mower". The term coined "brush hog" is because people use them in literally the brush. Bush Hog is a brand and people commonly call their King Kutter a bush hog. Not all mowers are created equal and I believe Bush Hog is the top of the line. Followed by the likes of Woods and Hardee. Countyline (tractor supply), King Kutter, Howse, and the likes are just economy mowers not meant to take a beating.