In an episode from a late 1970s to mid 1980s sci-fi series, the story revolved around an odd couple: a child-sized adult alien and an adult-sized child alien. What else I recall of the story is that the aliens' maturation follows the opposite path of that of humans. Children are adult sized and diminish to child size as they reach adulthood. The story is absurd and almost embarrassing, yet this is what I recall.
The name of the alien child may have been spelled and pronounced "Rokkos." I'm not entirely sure of the spelling and it could be a variant: Roccos, Rokos, or something similar. After several decades my memory of its pronunciation may have faded, though I am certain that the name began with an 'r,' had two vowels, both 'o,' and concluded with an 's.' Many google searches brought me completely unrelated results such as Rocco's Pizza and Spanish grocery stores.
One final detail is that, as per 1980's plastic aesthetics, both child and adult alien were clothed in golden gauze tunics and baggy pants with equally ridiculous gold-colored nylon page boy wigs.