What are pigs mammals or reptial?

Yes. They are of the kingdom Animalia, phylum Chordata, class Sauropsida, order Squamata, suborder Serpentes, family Atractaspididae. This places them in the family of Mole Vipers. They are closely related to other members of the Mole Viper family, such as the African Bighead, and Burrowing Asp. Their genus is Sus.