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Lingual papillae (singular papilla) are the small, nipple or hairâlike structures on the upper surface of the tongue that give the tongue its characteristic rough texture.hey are found on the upper surface of the tongue, scattered amongst the filiform papillae but are mostly present on the tip and sides of the tongue. They have taste buds on their upper surface which can distinguish the five tastes: sweet, sour, bitter, salty, and umami. They have a core of connective tissue.
They are the vallate papillae, everyone has them toward the back of the tongue. They vary in number up to 12 in a V shape toward the back of the tongue. They vary in size from time to time in the same individual and this is within normal expectations. So it's understandable that others in your group might not (apparently) have them. They do actually have them though not easily visible at the moment.