Not necessarily licking (I mean, if you do it enough…), but this is a thing
Cool story with interesting social, cultural, and scientific interactions.
It may have been discredited outside of simple iron deficiency since I last read about it, but dietary studies on humans are notoriously difficult to do.
That they would be reserved for nobility seems like it must be wrong. These are tiny animals that wouldn’t take much effort to raise. A small family could easily eat one. Just grab a pair and start raising them.
It’s not like a cow where you need large amounts of grazing land and then when you kill it, you have huge amounts of meat to deal with.
This is why animals in English have three names. One for the animal, raised by the commoners with Germanic origin (cow). One for the meat, eaten by the wealthy with French origin due to the Norman conquest (beef). And one used in scientific contexts coming from Greek or Latin (bovine)
It’s surely not any different than a squirrel, ground hog, or wild rabbit. People eat those all the time. Even meat rabbits seem comparable in size to a guinea pig. You can also just put them in a stew.
Also, as I mentioned, larger animals are also more difficult because you can’t just kill one for dinner. If you kill a deer, you have to process it to preserve it or share it with a larger community. Ain’t no freezers.
Side anecdote: My grandfather, as a 9 year old, used to go squirrel hunting and bring them home for his mom to cook. Before you go thinking this is some redneck thing, it was long island, less than 50 miles from Manhattan. It would have been during the war though.