slow as molasses in January vs tardigrade

slow as molasses in January

adj

  • Extremely slow. 

tardigrade

adj

  • Sluggish; moving slowly. 

noun

  • Sloth. 

  • A member of the animal phylum Tardigrada. 

How often have the words slow as molasses in January and tardigrade occurred in a corpus of books? (source: Google Ngram Viewer )