Which American food company, primarily known for its fruit spreads, manufactures the mass-produced frozen crustless sandwiches known as Uncrustables?

Smucker's

Kretchman and Geske began producing the sandwiches in Fergus Falls, Minnesota, in 1996, and The J.M. Smucker Company acquired the brand in 1998. Later additions included honey, reduced-sugar, chocolate-hazelnut, and raspberry varieties.