Cheat Mode:
Throughout Dinosaur Planet, you'll find wells that ask you to feed them 20 Scarabs. Feed them 20 Scarabs and you will get a Cheat Token. Go to the Warpstone Guardian in Thorntail Hollow and enter the maze. You will eventually find a well inside. Open your inventory, select a Cheat Token, then press A. This will unlock a cheat or give you a hint. Now unlock that cheat from the main 'Options' menu.

Cheat Token in Icy Mountain:
Go all the way to the left at the beginning. There will be a crack. Use a bomb spore to blow it up. Pay 20 Scarabs for the Cheat Token inside, which will unlock Sound Test Mode.

Cheat Token in Moon Mountain Pass:
Plant a Moonseed at the indicated location before Krazoa Shrine 2 to get to a well. Get the Cheat Token to unlock the Dinosaur Language setting.

Cheat Token in Thorntail Hollow:
Go to the well in the lobby of the store. Get the Cheat Token to unlock the staff credits.

Thanks to Revolution reader Will Fisher!