clamper vs climbing iron

clamper

noun
  • An attachment with sharp metal prongs, attached to a boot or shoe to enable the wearer to walk securely upon ice. 

  • One who, or that which, clamps. 

  • A circuit that restricts the amplitude of a waveform. 

verb
  • To complain in an irritating manner. 

  • To crimp. 

  • To move in a noisy and clumsy manner. 

climbing iron

noun
  • A kind of crampon attached to the shoe to aid with climbing. 

How often have the words clamper and climbing iron occurred in a corpus of books? (source: Google Ngram Viewer )