scrim·shaw 
(skrĭmshô′)
(skrĭmshô′)n. pl. scrimshaw or scrim·shaws
1. The art of carving or incising intricate designs on the teeth, bones, or baleen of whales.
2. A decorative article made by this art.
v. scrim·shawed, scrim·shaw·ing, scrim·shaws
tr. & intr.v.
To decorate (whale ivory or whalebone) with intricate carvings or designs or make such designs.
[Probably from SCRIMSHANDER.]
scrimshawscrimshaw on a sperm whale tooth