Answer:
Face with a tree skin like the sea. A great beast I am. Yet vermin frightens me.
With a halo of water and a tongue of wood, stone as skin long I stood. What am I?
I go around in circles but always straight ahead never complain no matter where I am led. What am I?
The 8 of us go forth and back to protect our king from a foes attack
You hold my tail while I fish for you. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.