The ornamental design for a floating waterpongtable, as shown and described.
FIG. 1 is a top plan view of the floating water pong table showing my new design
FIG. 2 is a right side elevational view thereof, the side opposite being a mirror image thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front end view thereof, the side opposite being a mirror image thereof; and,
FIG. 5 is an isometric view thereof.
The broken lines shown in FIGS. 1 and 5 are included for the purpose of illustrating features of the floating water pong table and associated elements that form no part of the claimed design.