Webster's Revised Unabridged Dictionary · 1913

Frounce

Frounce , intransitive verb

[Old English frouncen, fronsen, to told, wrinkle, Old French froncier, French froncer, perh. from an assumed Late Latin frontiare to wrinkle the forehead, Latin frons forehead. See Front, and compare 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.
Not tricked and frounced, as she was wont. — Milton

Frounce , intransitive verb

To form wrinkles in the forehead; to manifest displeasure; to frown. [Obsolete]
The Commons frounced and stormed. — Holland

Frounce , noun

1.
A wrinkle, plait, or curl; a flounce; -- also, a frown. [Obsolete] — Beau. & Fl
2.
An affection in hawks, in which white spittle gathers about the hawk's bill. — Booth