Not quite, To be honest I got crossed up with roasting a goose and a groundhog, sorry bout that. You slit the skin on the breast of a goose to let the grease run out.
Skin them and clean them like any small game, and then roast them.
If Marmots are anything like our groundhogs are though, be careful handling them as they will be flea ridden. The older ones tend to be more grizzled and have lots of fleas, but the young ones pick them up quickly also. They live in the same burrows and all.
You could really have fun cooking one using natural herbs and edibles around your area, could be quite the woods banquet.
Do not turn your nose up at a muskrat either, they are tasty to eat. Like the Marmot or groundhog, the young ones are best for eating, and you treat them the same.
Try shake and bake mix on one, Marmot or Muskrat, it really comes out good. Use the commercial mix, or your own secret recipe and cook em up!
Chuck