The Green version is seen on Page 57 of Tiki Quest. Listed as an Otagiri design, but only says "Japan" on the bottom. I also have a very similar mug in green, probably sold as a set?
Collector Gallery
Tiki Mug Design
Fierce Face Handled Tiki Mug Brown
in 3 collections
This fierce faced Tiki mug has a wave pattern around the top rim and an X-pattern around the bottom. It was produced in both a green and a brown glaze.