Moana is is the reverse of the Little Mermaid

• little mermaid: ocean princess wants to go to the land
  
• moana: land princess wants to go to the ocean
• little mermaid: big scary ocean lady is the enemy
• moana: big scary land lady is actually a friend
• little mermaid: villain has a necklace of magical importance
• moana: hero has a necklace of magical importance
• little mermaid: small good crab
• moana: large bad crab