I assume you mean Pixie Hollow, which is where Tink meets in AdventureLand (not FrontierLand).
You should be able to zoom down pretty tight on the maps on the official site.
But a quick description.
Tiana is at the Gazebo immediately upon entering Liberty Square across the bridge from the Hub (the main bridge that the parades use), turn to your left before getting to any of the buildings, or straight across the little bridge between the AdventureLand and Liberty Square bridges.
Pixie Hollow, as soon as you enter AdventureLand from the bridge from the Hub, turn to your right, there is a patio, right after the patio is the entrance to Pixie Hollow.
But like I said, zoom in on the maps on the official park site, they will show you where to go.