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 an enlarged view of a portion indicated with numeric 9 in FIG. 1; and,
FIG. 10 is an enlarged view of a portion indicated with numeric 10 in FIG. 1.
The evenly spaced broken lines depict portions of the toy gun that form no part of the claimed design. The dot dash dot broken lines depict the boundaries of the detailed enlargements that form no part of the claimed design.