Answer:
A dragons tooth in a mortals hand I kill I maim I divide the land.
To cross the water, I'm the way. For water I'm above, I touch it not and truth to say, I neither swim nor move. What am I?
You throw away my outside, you cook my inside. Then you eat my outside and you throw away my inside. What am I?
You throw me away, I find my way back. Traditionally, I'm wooden with an arch in my back. What am I?
In buckles or lace I help set the pace. The farther you go the thinner I grow.
Be sure to shout for its answers are weak, but there is no language it cannot speak.