The Collaborative International Dictionary of English v.0.48:

Sprunt \Sprunt\ (spr[u^]nt), v. i. [Cf. Sprout, v. i.]
   To spring up; to germinate; to spring forward or outward.
   [Obs.]
   [1913 Webster]

   To sprunt up, to draw one's self up suddenly, as in anger
      or defiance; to bristle up. [Local, U.S.]
      [1913 Webster]