The ornamental design for a dollhead, as shown and described.
FIG. 1 is a right-side perspective view of a doll head showing my new design according to a first embodiment.
FIG. 2 is a front view of my new design shown in FIG. 1.
FIG. 3 is a rear view of my new design shown in FIG. 1.
FIG. 4 is a right-side view of my new design shown in FIG. 1.
FIG. 5 is a left-side view of my new design shown in FIG. 1.
FIG. 6 is a top view of my new design shown in FIG. 1; and,
FIG. 7 is a bottom view of my new design shown in FIG. 1.
The broken lines consisting of dot-dash lines are boundary lines that show that the claimed design extends to the boundary line but does not include the boundary line. The remaining portions of the hair accessory for a doll rendered in short broken lines form no part of the claimed design.