How do you spell open in the ancient ruins on Shark Tooth island?

Answer 1

In the Underground Ruins
You have to spell OPEN using the symbols on the seven teeth. The translation key is on the journal page on the roof of the ruins. To get the page, push the large block to the right until you can jump up to the hanging vine. (Beware falling giant coconuts.) Go to the second platform and jump hard to the left to reach the roof. Once you enter the code, press the nose of the face. The light will turn green and the door will open.
To open the door without getting the translation page, push the 3rd, 4th, 6th, and 7th teeth, counting from the left side all as one row of teeth.

What do the symbols look like
1. Triangle pointing down.
2. Two squares on top of each other with a line through them (square 8)
3. A square with a HALF square around it.
4. The squiggly shape that looks like a snail.

Answer 2

Professor Hammerhead's journal is in the Museum. The missing page is on top of the ruins. Climb up using the big block and jump left from the platform.

Spell "open" by pressing the four symbols that correspond to the 4 letters, then press the nose.