Definition of "froster"

A froster and a cake sealer had repeated attacks of dermatitis on returning to their work, although the cause could not be ascertained.

1941, Oswald Fenton Hedley, Heart Disease in Philadelphia Cardiac Clinics, page 17

Julie was a froster, the glamour job at the factory. She wore her cute white hat cocked at a jaunty angle while working a big white bag of frosting, twisting it rapidly in her hands to create the various designs on top of the gâteaux.

2016, Martha Grimes, Ken Grimes, Double Double: A Dual Memoir of Alcoholism, page 88

To standardize his rapid-freeze process, Birdseye devised an iron container with steel plates. Within them he placed packages of fresh fish in a low-temperature brine refrigerant. Knowing that the public would be wary, Birdseye named the contraption a froster rather than a freezer.

2004, Nancy Rubin, American Empress, page 140