farrow vs wolf cub

farrow

noun

  • A litter of piglets. 

verb

  • To give birth to a (litter of piglets). 

adj

  • Not pregnant; not producing young (not calving) in a given season or year; barren. 

wolf cub

noun

  • A young wolf. 

How often have the words farrow and wolf cub occurred in a corpus of books? (source: Google Ngram Viewer )