The ornamental design for a toygun, as shown and described.
FIG. 1 is a first perspective view of a toy gun showing my new design;
FIG. 2 is a second perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a back view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof;
FIG. 8 is a bottom view thereof;
FIG. 9 is an enlarged view of the selected portion 9 in FIG. 1; and,
FIG. 10 is an enlarged view of the selected portion 10 in FIG. 2.
The broken lines shown in the drawings depict portions of the toy gun that form no part of the claimed design. The dot dash dot broken lines depict boundaries of the detailed enlargement that form no part of the claimed design.