If I don't get enough sleep will it stunt my growth?

Maybe. Depends on the severity and duration of sleep deprivation. The evidence is indirect, since sleep deprivation affects growth hormone levels, and other growth related hormones. No study involving depriving children of sleep in order to prove an effect on growth will ever be done.
Maybe. Human growth hormone (hgh) is particularly released during delta phase of sleep, the deepest sleep level. In an adult, hgh is involved in many pathways involved in maximum tissue and organ performance and minimizes age related breakdown. Remember, it is not necessarily total sleep time but more so the quality and level of delta sleep levels that may be at play.