I am perplexed that turbine pilots state that they are unaware of basic engine parameter notation.
Wf fuel flow
Np prop RPM
NG or N1 compressor RPM
TT or TIT Turbine Temperature
Well, I could show you the flight manuals and training notes (helos - from Flight Safety) and the only parameters talked about are, in the order of your listing, fuel flow, rotor RPM, N1, N2 (missing from your list) and ITT. Not a wf to be seen anywhere.