The Collaborative International Dictionary of English v.0.48:

Frounce \Frounce\, v. i.
   To form wrinkles in the forehead; to manifest displeasure; to
   frown. [Obs.]
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         The Commons frounced and stormed.        -- Holland.
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The Collaborative International Dictionary of English v.0.48:

Frounce \Frounce\, n.
   1. A wrinkle, plait, or curl; a flounce; -- also, a frown.
      [Obs.] --Beau. & Fl.
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   2. An affection in hawks, in which white spittle gathers
      about the hawk's bill. --Booth.
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The Collaborative International Dictionary of English v.0.48:

Frounce \Frounce\, v. i. [imp. & p. p. Frounced; p. pr. & vb.
   n. Frouncing.] [OE. frouncen, fronsen, to told, wrinkle,
   OF. froncier, F. froncer, perh. fr. an assumed LL. frontiare
   to wrinkle the forehead, L. frons forehead. See Front, and
   cf. Flounce part of a dress.]
   To gather into or adorn with plaits, as a dress; to form
   wrinkles in or upon; to curl or frizzle, as the hair.
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         Not tricked and frounced, as she was wont. --Milton.
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