The ornamental design for a ox shaped coinbank, as shown and described.
FIG. 1 is a front elevational view of a ox shaped coin bank showing my new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a perspective view thereof.
The broken lines showing portions of the ox shaped coin bank in FIG. 6 are included for information purposes only and form no part of the claimed design.