The Hidden City (1950)

Nature photographer Dennis Johnson is astounded to see a young white boy swinging through the jungle. His host, Hassan Emir of the Hidden City, tells him the continent is full of of stories of children being raised by wild animals. The Emir sends out his henchman to kill Bomba. Seriously wounded, Bomba floats down the river on a fallen tree and is rescued by a village girl, Leah. When he learns that Leah is a princess whose father was overthrown by Hassan, Bomba sets out to help her reclaim her title.