What is "scrag whale"

Scrag \Scrag\ (skr[a^]g), n. [Cf. dial. Sw. skraka a great dry tree, a long, lean man, Gael. sgreagach dry, shriveled, rocky. See Shrink, and cf. Scrog, Shrag, n.]

1. Something thin, lean, or rough; a bony piece; especially, a bony neckpiece of meat; hence, humorously or in contempt, the neck.

   Lady MacScrew, who . . . serves up a scrag of mutton on silver.
   --Thackeray.

2. A rawboned person. [Low]
   --Halliwell.

3. A ragged, stunted tree or branch.

   Scrag whale (Zo["o]l.), a North Atlantic whalebone whale ( Agaphelus gibbosus). By some it is considered the young of the right whale.

n. A North Atlantic whalebone whale, (taxlink Eschrichtius gibbosus species noshow=1). By some it was considered the young of the right whale, but is now generally considered to be part of an extinct population of the gray whale, (taxlink Eschrichtius robustus species noshow=1).