The latest bits for the Viking Mythos project veer into more traditional Norse culture. The Úlfhednar were berserker warriors who embraced the spirit of the wolf, as opposed to the more traditional bear. Historically, the transformation was assisted by donning pelts and body parts from wolves.
I want to take that idea and give it more of a Mythos spin. These coyote teeth, stand-ins for the far more expensive wolf teeth, will be part of a ritual fetish. I'm envisioning a pelt adorned with teeth and claws. Tying that imagery back into the Mythos, I'm planning to put together the accoutrements for whipping up the Draught of Ubbo-Sathla. That Elder God's protoplasmic, ever-shifting nature seems like a good match for the "truth" behind the Viking legends.