The ornamental design for an artificial nailtipplug, as shown and described.
FIG. 1 is a perspective view of an artificial nail tip plug showing my new design, shown in an environment of use;
FIG. 2 shows another perspective view thereof, shown in a second environment of use; and,
FIG. 3 is a top plan view thereof.
In the drawings, the broken line showing a number “1” represents portions of the article which form no part of the claim. The remaining broken lines represent environmental subject matter. None of the broken lines form part of the claimed design.