Do you know ghouls from goblins and ghosts?
pedomorphosis pe·do·mor·pho·sis (pē'də-môr'fə-sĭs)
Variant of paedomorphosis.
retention by an organism of juvenile or even larval traits into later life. There are two aspects of paedomorphosis: acceleration of sexual maturation relative to the rest of development (progenesis) and retardation of bodily development with respect to the onset of reproductive activity (neoteny).