thingo vs thingummy

thingo

noun
  • A thingamajig; something the name of which is unknown or cannot be recalled. 

thingummy

noun
  • Synonym of thingy: something one cannot remember the name of, or is unable to or does not care to specify precisely. 

  • Synonym of whatshisname: someone one cannot remember the name of. 

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