John- I have only eaten a few dozen, when living back East in Ontario. I have also eaten Hoary Marmots, shot on Hudson's Bay Mountain in Smithers.
That largest Ground (Woodchuck) Hog I shot back there, was 13 pounds.
The Marmots on Hudson's Bay mountain are over double that size, indeed, up to 30 pounds. The fat from around the organs, is so high in oil, the fat can be bagged and frozen (never gets REALLY hard), then when needed, thawed and rubbed into your boots for an incredible waterproofer.
After doing this, the hands must be washed with a good degreasing agent, or as i found, twice with a good dish soap, just to get the oil off your hands.
The oil also makes good patch lube for muzzleloading guns.