The tallest volcanic plateau mountains in New Zealand are the Central Plateau, specifically the Ruapehu, Tongariro, and Ngauruhoe volcanoes. While there are other mountains on the Central Plateau, these three are the tallest and most well-known volcanic peaks.

Here's a breakdown:

* Ruapehu: The tallest of the three at 2,797 meters (9,177 feet).

* Tongariro: Reaching 1,967 meters (6,453 feet).

* Ngauruhoe: Standing at 2,291 meters (7,516 feet).

So, while the Central Plateau is the region, the individual tallest volcanic peaks are Ruapehu, Tongariro, and Ngauruhoe.