Njongo (also Ñongo) is a general batá toque, not tied to one specific Orisha.
The furius.ca toque database counts Ñongo among the general toques, like Chachalokafún, Iyesá and Yakotá.
In The Artistry of Afro-Cuban Batá Drumming, Kenneth Schweitzer devotes two chapters to Ñongo: one to the traditional toque, comparing two recordings, and one to a modern variant associated with the group Los Chinitos.