unblock vs unfreeze

unblock

verb
  • To remove or clear a block or obstruction from. 

  • In whist, to throw away a high card so as not to interrupt one's partner's long suit. 

  • To free or make available. 

  • To enable communication again, via telephone, instant messaging, etc., with (somebody previously blocked). 

noun
  • The removal of a block or blockage. 

unfreeze

verb
  • To defrost something. 

  • To resume movement. 

  • To release from a previously locked or frozen state. 

  • To thaw. 

  • To release previously suspended financial assets. 

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