I know this is a joke, but this is an actual thing in linguistics called reduplication. For example, hito (人) in Japanese means person, and hitobito (人人) means

I know this is a joke, but this is an actual thing in linguistics called reduplication. For example, hito (人) in Japanese means person, and hitobito (人人) means people, more or less. Japanese isn't the best example since they don't have "real" plurals but I think it's a fascinating phenomenon.