Are there any NACA airfoils that resemble the X-29's wing?
From Mason’s Perspective on the X-29:


  The other issue with this airfoil is that every Grumman aerodynamicist felt the need to “improve” it, so that there were many variations. I think the airfoil that was used on the X-29 was known as K-Mod 2. I’m not sure anybody can say with certainty what the actual airfoil coordinates are. Grumman was not good with
  documentation


The airfoil appears on page 9 of that memo:



The reference given for it is Boppe, which I assume to mean the article "Computational Aerodynamic Design: X-29, the Gulfstream Series and a Tactical Fighter" by Charles W. Boppe in SAE Transactions, Vol. 94, Section 6 (1985), pp. 424-468.

Supposedly you can access that article in exchange for signing up with the host service, but I'm not willing to try from my current machine.