head-scratching vs puzzlesome

head-scratching

adj

  • Confusing, perplexing, puzzling. 

noun

  • Confusion. 

puzzlesome

adj

  • Marked by puzzling, puzzlement, or perplexity; perplexing; bewildering 

How often have the words head-scratching and puzzlesome occurred in a corpus of books? (source: Google Ngram Viewer )