Is it harmful to eat this kind of snack?

You are talking about "hairy egg", that's what we call it there. It is an egg that has not hatched a chick.

One type is stillborn eggs, which are stillborn chicken eggs caused by temperature and humidity or bacterial and parasitic infections within 14 to 21 days of incubation of fertilized eggs. After people eat it, it is extremely harmful to health. Mainly during the process of hatching chicks, due to temperature, humidity or salmonella infection and parasite contamination, the development of chicken embryos stops and dead embryos are formed. The protein, fat, sugar, inorganic salts, vitamins and other nutrients contained in the egg itself have all changed during the incubation process, and most of the nutrients have been consumed by the development of the embryo. Even if some nutrients can be retained, it cannot be compared with fresh eggs. Moreover, the shells of most raw eggs have been cracked and are easily contaminated by bacteria. When the temperature is suitable, it is very conducive to the reproduction of bacteria. According to tests, almost 100 raw eggs can contain E. coli, and some have also detected Staphylococcus aureus, Typhoid bacilli, Proteus, etc.

One type is live lanugo eggs. That is, when the chicken hatches, the hatching is intentionally stopped to form viable lanugo eggs.

I bought it from a roadside stall, so I don’t think I should eat it.