Entry in progress—B.P.
 
(Oxford English Dictionary)
butterhorn, n.
A sweet rolled pastry made of butter and yeast dough, typically in the shape of a horn or crescent and glazed or topped with flaked nuts. Also more fully butterhorn roll.
1920   Railway & Marine News May 33/2   A railroad manager..stops his limousine at a mere bake shop to purchase a butterhorn.
1941   Washington Post 25 Jan. 13/4   Butterhorn rolls have a luxury look, yet they require only a few minutes of the cook’s time.
 
26 March 1904, Green Bay (WI) Gazette, pg. 10, col. 5:
THe only bakery in the city where up-to-date fine pastry is made such as pure Almond Macarons, Lady Fingers, Oyster Patties, Butter Horns, etc.
(Willaert’s Quaker Bakery.—ed.)
 
28 April 1917, Modesto (CA) Evening News, pg. 2, col. 5 ad:
Our Butter Horns, Cream Snails, Jelly Rolls, Rusks, Parkerhouse Rolls, Snails and Pies will be sold at prevailing prices until further announcement.
SCHAFER’S
Grocery and Baking Depts.