Do acyl fluorides exhibit resonance donation or inductive withdrawal?
Yes, acid fluorides exist.  You can purchase acetyl fluoride from Sigma-Aldrich.

Look back at these two questions for background on how the increased contribution from the triple-bonded carbonyl resonance structure (see below) will lead to an increase in the carbonyl ir stretching frequency (e.g. the triple-bonded carbonyl resonance structure will lead to a stiffening of the carbonyl bond and consequently shift it absorption to higher energy).


Ring Strain and C=O Stretching Frequency
Triple Bond Character in Acyl Chlorides


Here are the resonance structures we considered in the case of an acid chloride.



Resonance structure IV is what we're calling the "triple-bonded" carbonyl structure.

The carbonyl stretch for a acetyl chloride (I, R=Methyl) occurs at 1818 ${cm^{-1}}$.  In the case of acetyl fluoride (replace Cl with F in the above structures) this stretch occurs at 1869 ${cm^{-1}}$, significantly higher.  This suggests that resonance structure IV plays a larger role in the case of acid fluorides, despite resonance structure III presumably also playing a larger role compared to the acid chloride case.  The stability of $\ce{F-}$ vs. $\ce{Cl-}$ seems to be a very significant factor.