Beans from the two Melanesian countries are a central part of the blend in Nestlé Japan's new Sublime Volcanic KitKat launched this week in Tokyo, Radio New Zealand International reports.
It comes in a series of three flavours from volcanic islands of the Pacific.
The Vanuatu flavour is sourced Malakula Island, the Papua New Guinea flavour is from Karkar Island, and the Philippines bar from Mindanao Island.
One of the world's biggest food and health companies, Nestlé has also been sourcing palm oil for some of its products from a supplier destroying rain forests in Indonesia's Papua region.
However, in October Nestlé vowed to blacklist palm oil suppliers that do not comply with its responsible sourcing policy.
The Swiss-headquartered company says it is committed to using 100% responsibly sourced palm oil by 2020.