How many are you going to do?
If it's a couple, then no, not really.
It could be a 6" or 8" pipe cut in half lengthwise if you want.
You could make one if you like. It's not hard to do with an angle grinder and a belt sander.
Get a beam, a log, I just prefer hardwood. lay a stretcher on it and trace that from the top on to the beam. cut that out, and then use an old bucket and cut off the bottom, and use the angle grinder to remove most of the material to match the same contour as the 5 gallon bucket. You only need to do this for the first 3 feet. (that is all you use)
Then use the belt sander to smooth it out so you can't feel with your hand any dents or unevenness. Then round over the underneath to make it smooth too. Last will be to use the belt sander to run up and down the way you would run the fleshing knife.
I made one out of Mesquite. it's got a base that i can stand on, with rubber feet on the bottom to keep it from moving during fleshing. One end is connected to the base, and folds flat and stores away when not in use. I also suggest sanding it as smooth as you can, and lots of layers of finish that you choose. I didn't want that nasty fatty mess soaking in.