Shadewood But I never met a girl I could trust

She watched the man step from the bushed towards her, earning him a grin from around the gift.
It was a large tooth, slightly curved and sharply tipped and yet very smooth.
It was a whale tooth, washed up from a carcass that had been in turmoil in the storm, dislodging the piece to find itself at Phex's feet on the shore.

Her tail waved in greeting, happy to see Laroche still here and seemingly well. She looked at his face, trying to gauge the wounds on his face that seemed to have had some tending. She gently placed the tooth down, wiggling her jaw from having it clasped around the object for so long, "Hey there, uh, Moody," she tried ok, with a grin, "I brought a gift for you," her eyes glinted with glee, waiting for his reaction. She hoped it'd be just as interested as she was when she found it.
What creature could have a tooth that big?