Kalonian Twingrove's power and toughness are each equal to the number of Forests you control.
When Kalonian Twingrove enters the battlefield, create a green Treefolk Warrior creature token with "This creature's power and toughness are each equal to the number of Forests you control."
The ability that defines Kalonian Twingrove’s power and toughness works in all zones, not just the battlefield.
The power and toughness of both Kalonian Twingrove and the token it creates will change as the number of Forests you control changes.