Is this spot on my 8-month German Shepherd Husky mix's elbow normal?

Given the appearance and location, it looks as though this is just Fenrir's elbow callus. Oftentimes elbow calluses can have a tiny bit of dry, white scaling as the skin normally turns over. Calluses tend to form over high pressure areas, like elbows, to protect the skin. Large breed dogs in particular tend to develop more calluses than smaller dogs simply due to the weight and pressure placed when they lay on hard surfaces. As long as Fenrir continues to walk normally, seem comfortable, and the skin isn't red or having discharge, I don't see any cause for concern here. As he gets older, I wouldn't be surprised if the callus gets a little bit bigger. I hope that everything goes well!