The ornamental design for a snowtool with telescoping handle, as shown and described.
FIG 1 is a perspective view of a snow tool with telescoping handle showing my new design, the broken lines showing bristles being included for the purpose of illustrating portions of the article that form no part of the claimed design;
FIG. 2 is a side elevation view thereof;
FIG. 3 is a front-elevation view thereof;
FIG. 4 is a side elevation view thereof;
FIG. 5 is a rear elevation view thereof; and,
FIG. 6 is a perspective view thereof with the handle in an extended position.