Hand Carved Hardwood Sawtooth War Club Shaped Like Human Face Mystery

I acquired this war club at a local rummage sale here in Arizona. I do think it's a war club, but I do not know the origin or era. I researched it but did not see any familiar in this shape. It has a sawtooth design cut into one side. I'm not sure if the forehead area used to hook down as it looks like it might have broken off a long time ago and smoothed over because it isn't jagged or fresh where any of the breaks or chips are. It is a very hardwood, not sure of what kind. The chin area is sort of like a ball shape. Probably the main hitting area. It measures 20.5" long. If you have any information on origin or era I would really appreciate it! Thank you!