If you still don't know what Cfish stands for, here's the simplest answer: Stockfish is written in C++ while Cfish is the same engine written in C, by Ronald de Man, the programmer of the famous Syzygy tablebases.
C is older, less user friendly for the programmer but more native, closer to the the machine. That's why converting the original Stockfish code to C code can help the compiled engine work way faster.
Cfish is expected to be 10-15 ELO higher than official Stockfish. You can measure the gap yourself or you can believe me as an easier alternative.
GET Cfish 2016.12.03 for 32-bit arm7 nopie
GET Cfish 2016.12.03 for 32-bit arm7 pie
GET Cfish 2016.12.03 for 64-bit arm8
In case of trouble downloading from box, refer to THIS POST.