The ornamental design for a weeding toolhead, as shown and described.
FIG. 1 is a perspective view of a weeding tool head showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a right side elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left 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 the weeding tool head is included for the purpose of illustrating portions of the article and forms no part of the claimed design.