larval vs unripened

larval

adj
  • Undeveloped, latent. 

  • Characteristic of larvae. 

  • Having the form or shape of a larva. 

  • Of or relating to a larva or larvae. 

  • Being a larva. 

unripened

adj
  • Not ripened; still unripe. 

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