The Collaborative International Dictionary of English v.0.48:

Craunch \Craunch\ (kr?nch), v. t. & i. [imp. & p. p. Craunched
   (kr?ncht); p. pr. & vb. n. Craunching.] [See Crunch.]
   To crush with the teeth; to chew with violence and noise; to
   crunch. --Swift.
   [1913 Webster]

WordNet (r) 3.0 (2006):

craunch
    v 1: press or grind with a crushing noise [syn: crunch,
         cranch, craunch, grind]