A better way to look at it is that there is the single function, Feeling, and different types will have different perspectives that prefer either an internal or external orientation of it.
Type is determined by the preferred perspectives, not really "using" one function more or less in comparison to another.
So en ENFP will prefer an internal orientation of Feeling, and it can become ambiguous ans they are really an extravert through their dominant intuition, so with the E and F in the code, they are "extraverted" and "Feeling", so when engaging both preferred functions (N and F), they might in some way appear to be "using" extraverted Feeling. But if they are really FP, the internal orientation will ultimately be preferred as the standard of their values, regardless of how much it might seem to get externalized.