You asked:

is guinea pig a common food

No. Guinea pig is not a common foodstuff.
guinea pig
guinea pig

guinea pig (a stout-bodied nearly tailless domesticated cavy; often kept as a pet and widely used in research)

tk10publ tk10canl

Say hello to Evi

Evi is our best selling mobile app that can answer questions about books, music, films, conversions, history, people, places and much more.

To experience the full power of Evi you can download her app for free on iOS, Android and Kindle Fire.

Other ways this question is asked: