Pigmask Privates were a rank within the Pigmask Army in EarthBound 64, and goes entirely unused in the final release of MOTHER 3. Because of this, things like their battle music, drops, experience points, etc. is unknown.
They were the lowest rank, being below the Pigmask Sergeants. Their regular variant sported yellow goggles and pig snout, brown gloves and boats, and a light-green helmet and uniform, with open sides which allows you to see that they wear nothing underneath besides white underwear. The weapon they use is a spear, similar to the Pigmask Sergeant, but slightly differs in look. They also had environmental variants, that being jungle and snow. The jungle variant was the same as regular but the light-green of the helmet and uniform became dark green and had a camo design. The snow variant replaced the light-green with white.