This is a mug with a Marquesan inspired Tiki head on each end. The top head has two rows of gap-toothed teeth. The bottom face is smaller, upside down, and mirrors the top face but with only a top row of teeth exposed.

From Tiki Farm:

"Originally launched in 2013, long before other mug makers entered the scene, the KuKu, Marq Marq and Moko Moko mug designs were a hit! Now we offer them in their 2nd Edition colors. These big and hefty mugs are some of the heaviest production mugs you will hold in hand!

Featuring Big Toe’s classic, chunky-splintered toothy design-style, these mugs are classic in their intentions, but with that special Big Toe twist of 'whacky'!

Marq Marq 2nd Edition stands 7.25 inches high and holds 21 oz."