This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Ninki Nanka (Western Africa)
A Ninki Nanka is a legendary creature in West African folklore. Descriptions of the creature vary, but most contend that the animal is reptilian and possibly dragon-like. According to tradition, the Ninki Nanka lives in the swamps of West Africa.
The animal is said to be extremely large and very dangerous. It is said that when children get too confident and feel they can disobey their parents and go into the swamp they will be taken by the Ninki Nanka. This creature's tales were never recorded in any sort of non-modern text but the story of it has spread from tribe to tribe all over Africa.