The ornamental design for a sharksnorkelmask, as shown and described.
FIG. 1 is a perspective view of a shark snorkel mask, showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken line showing of internal surfaces of the mask is for the purpose of illustrating portions of the shark snorkel mask that form no part of the claimed design.