a.k.a. Trader Vic's PNG Abelam Yam Tiki Mug, Trader Vic's Papua New Guinea Abelam Yam Tiki Mug
From Trader Vic's:
"Designed by Trader Vic's legend, Javier Del Campo, the Abelam yam mug is part of our Papua New Guinea mug collection. This mug holds 24 OZ. The inspiration for this design comes from the Abelam people who live east of Sepik. They are a farming society in which giant yams play a significant role."
There is also a mini tiki mug version of this same design.