malt sugar vs maltose

malt sugar

noun
  • maltose 

maltose

noun
  • A disaccharide, C₁₂H₂₂O₁₁ formed from the digestion of starch by amylase; is converted to glucose by maltase; it is an isomer of trehalose 

How often have the words malt sugar and maltose occurred in a corpus of books? (source: Google Ngram Viewer )