I'm looking for a sea monster, real or imagined. What I need for my story is something which is a threat to a sailing ship, can be killed by a sailing ship's crew, and has teeth large enough to be used for scrimshaw. 
If necessary, I'll make something up. The only ones I can think of are krakens and leviathans, but those aren't quite right.
Thanks in advance for any ideas!

If necessary, I'll make something up. The only ones I can think of are krakens and leviathans, but those aren't quite right.
Thanks in advance for any ideas!