Well, you are what you eat or so they say. The French have a specialty for which they are renown for, Grenouille. This happens to be gourmet frog. This is the most recognized reason for this nickname. Of course, others believe it is rooted in royal symbols from the shields of either Clovis I or Charlemagne but that seems unlikely since Clovis lived over 1500 years ago and Charlemagne’s symbol was a black eagle.