The ornamental design for a toydunebuggy, as shown and described.
FIG. 1 is a first perspective view of a toy dune buggy 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; and,
FIG. 8 is a bottom view thereof.
Any broken lines represent boundaries of the claimed design. Areas bound in broken lines and shown in half-tone de-emphasized shading illustrates portions of the toy dune buggy that form no part of the claimed design. Neither the broken lines themselves nor the lightened areas contained within the broken lines form any part of the claimed design.