The ornamental design for a dolphinbubblegun, as shown and described.
FIG. 1 is a first perspective view of a dolphin bubble 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; and,
FIG. 9 is an enlarged partial view of the nozzles in FIG. 1.
The broken lines are for the purpose of illustrating portions of the dolphin bubble gun that form no part of the claimed design. The dash-dot broken lines represent the boundaries of the enlarged partial view of FIG. 9 and form no part of the claimed design.