Mowgli the man-cub is also called 'Mowgli the Frog'.
Some quotes from The Jungle Book...
- Mowgli's Brothers
“Keep him!” she gasped. ”He came naked, by night, alone and very hungry; yet he was not afraid! Look, he has pushed one of my babes to one side already. And that lame butcher would have killed him and would have run off to the Waingunga while the villagers here hunted through all our lairs in revenge! Keep him? Assuredly I will keep him. Lie still, little frog. O thou Mowgli--for Mowgli the Frog I will call thee--the time will come when thou wilt hunt Shere Khan as he has hunted thee.”
- Kaa's Hunting
"In whose name, Brother?" Rann had never seen Mowgli before, though of course he had heard of him.
"Mowgli, the Frog. Man-cub they call me! Mark my tra-il!"
- The King's Ankus
Mowgli ran his hand down the diagonal checkerings of the immense back. 'The Turtle is harder-backed, but not so gay,' he said judgmatically. 'The Frog, my name-bearer, is more gay, but not so hard. It is very beautiful to see-like the mottling in the mouth of a lily.'