Lapp vs Lapp language

Lapp

name

  • The language of the Lapp peoples. 

adj

  • From Lapland or of the Lapp peoples 

noun

  • An indigenous person from Lapland. One of the Sami people. 

Lapp language

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