Bomba the Jungle Boy at the Moving Mountain by Roy Rockwood
This is #2 in the Bomba Series by Roy Rockwood

This tale describes how Bomba defeats a band of dangerous headhunters from the distant Giant Cataract. This time they are lead by Tocarara, the co-Chieftain and half brother of the wounded Nascanora. It was Bomba himself who wounded Nascanora. The Medicine Man Ruspak is present again and is even forced by the Jungle Boy to cure a dying Cody Casson!

After the savages retreat to their old haunts, Bomba drops Cody off with Pipina the old Indian squaw and finally begins his journey to the Moving Mountain, where Jojasta the Medicine Man rules in a ruthless and cruel fashion. Along the way, he battles jaguars and snakes and rescues the Parkhursts, a family of explorers, from the headhunters.

Once Bomba arrives at the Moving Mountain, he saves the lives of Ashati and Neram, former slaves of the Medicine Man and he confronts Jojasta who verifies that Bomba does indeed look like Bartow but that if he wanted to learn more of him and Laura, he must undertake another journey, this time to Sobrinini's isle, the Isle of Snakes, ever so close to the Giant Cataract!