The "temple" is just another word for the Ancient Ruins to the right of Main Street.
To open the underground door, you have to press the teeth that have the symbols that are the same as the letters OPEN.
You will find the translation Page from Hammerhead's Journal on the roof of the ruins. (Push the white block right to climb the vines, then jump left from the platform.) At the door, you press the symbols (on the teeth) that have the letters OPEN, to open the door.
(Counting all 7 teeth as one row, you will press the 3rd, 4th, 6th, and 7th teeth, then the nose.)
What They Look Like
O. Triangle pointing down.
P. Two squares on top of each other with a line through them.
E. A square with a HALF square around it.
N. The squiggly shape that looks like a snail.
No. The "temple" is the ancient ruins to the right.
In the Temple
shark tooth island
The combination is O.P.E.N.
Somewhere in the temple.... 0_o :P
go down into the ancient ruins and all the way to the left there will be the temple
its there when you leave main street there will be a big building that's the temple
code .........................................................................................................................................................................................................................................up down
Shark tooth island is when you have to to save people from a giant shark
2 are in the temple 1s from the coconut milk guy
IN the temple, it means you have to hit the right ones and they let you in
get it in the temple in shark tooth to get it u need a decoder.