less vs not too many

less

det
  • Fewer; a smaller number of. 

  • A smaller amount of; not as much. 

prep
  • Minus; not including 

conj
  • unless 

noun
  • A smaller amount or quantity. 

adv
  • To a smaller extent or degree. 

  • Used for constructing syntactic diminutive comparatives of adjectives and adverbs. 

not too many

How often have the words less and not too many occurred in a corpus of books? (source: Google Ngram Viewer )