Grig /(grĭg)/

Grig

n.
  1. A cricket or grasshopper. (Zool.) [Prov. Eng.]
  2. Heath. [Prov. Eng.]

Phrases & Compounds
As merry as a grig
[etymology uncertain], a saying supposed by some to be a corruption of “As merry as a Greek; ” by others, to be an allusion to the cricket.