The ornamental design for a “fish hook,” as shown and described.
FIG. 1 is a perspective view of a fish hook showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear 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 view thereof; and,
FIG. 7 is a bottom view thereof.
The dash-dot-dash lines represent a boundary line. The remaining broken lines depict environment and are for illustrative purposes only and form no part of the claimed design.