The ornamental design for a crownhat, as shown and described.
FIG. 1 is a perspective of the crown hat showing my new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines within the bounds of the crown hat represent environmental subject matter that forms no part of the claimed design. All other broken lines illustrate portions of the crown hat that form no part of the claimed design.