The ornamental design for a toygun, as shown and described.
FIG. 1 is a perspective view of the toy gun showing my new design;
FIG. 2 is a perspective view thereof from another angle;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof;
FIG. 9 is a partial enlarged view of portion 9 in FIG. 1; and,
FIG. 10 is a partial enlarged view of portion 10 in FIG. 1.
The evenly spaced broken lines showing portions of the toy gun form no part of the claimed design; the unevenly spaced broken lines delineate areas of the figures shown enlarged and form no part of the claimed design.