I have never eaten Ponmo since on this side of the planet, it is not considered edible, except the one obtained from the pig, and it is called chicharrón.
When eaten, it's like a snack, but its high saturated fat content raises bad cholesterol and can cause heart problems. Does it happen the same with the skin of the cow?
Interestiny, ponmo from the cow skin has no fat, infact it is recommended for obese people to help check there fatty level.
Tbh, I don't know much about the ones from pig, i would actually find out.