According to the list on BZPower.com, that is Takanuva.
The vehicle Pohatu is driving is the Rockoh T3. The vehicle Antroz or someone very like him is driving is the Jetrax T6. The vehicle Lewa is driving is the Axalara T9. And that other one is Vultraz.
LEGO seems to be changing BIONICLE, now.
Also, this was my first post. :)
-Pocun