sweet cream vs whipped cream

sweet cream

noun
  • Cream: the oily part of milk that rises to the top. 

whipped cream

noun
  • Cream, at least 30% of which is milkfat, possibly also containing emulsifiers and/or stabilizers but nothing else, which is then whipped. 

  • Thick cream that has had air incorporated into it by rapid beating. 

How often have the words sweet cream and whipped cream occurred in a corpus of books? (source: Google Ngram Viewer )