This is a mug shaped like a cartoonish squatting witch doctor with large bug eyes, a bone through his nose, and a hat with skull and crossbones, holding a shrunken head.

From Lost Temple Traders:

"Kaduku the Witch Doctor mug is a collaboration between Lost Temple Traders and Atomica Exotica. The mug stands 8” tall, holds 28oz, is limited to 250 mugs in each colorway and is produced by Munktiki Imports. "

There is a bone glaze version and a green glaze version that preceded the Fallout and Mystic editions.