Ok, the "mystery" is solved. It is indeed a Marmot. They seem to have invaded the area this year for some reason. I've now found at least 4 different dens and animals. Even the original one I questioned has changed a bit. The bulge on the head is gone and the bare nose now has fur on it like normally expected. Maybe what threw me off were injuries from a scrape or just normal "wear and tear" from it digging a burrow. I've confirmed this with the local natural history museum.

On a happy side note. I've not seen the foxes yet but I've found an active den with a whole lot of bird pieces around it. Hopefully I can get some pictures of them before the refuge personnel trap the foxes.