Jane
Successfully complete the Terk challenges in world 1 to unlock Jane in the water skiing or river surfing challenges.

Porter
Successfully complete the Terk challenges in world 2 to unlock Porter in the water skiing or river surfing challenges.

Terk the monkey
Successfully complete the three Terk challenges in the final levels of the game to unlock Terk.

Ground Tumble trick move
Successfully complete the Terk challenges in world 1 to unlock the Ground Tumble trick move for jungle exploration.

Scarecrow trick move
Successfully complete the Terk challenges in world 2 to unlock the Scarecrow trick move for the water skiing challenges.

Corkscrew trick move
Successfully complete the Terk challenges in world 3 to unlock the Corkscrew trick move for the river surfing challenges.