The ornamental design for crabgrass grabber, as shown and described.
FIG. 1 is a perspective view of a crabgrass grabber, showing my new design;
FIG. 2 is a front elevational view of the invention;
FIG. 3 is a rear elevational view of the invention;
FIG. 4 is a right-side elevational view of the invention, the left-side elevational view being a mirror image thereof, shown without the handle;
FIG. 5 is a top plan view of the invention; and,
FIG. 6 is a bottom plan view of the invention.
The broken line showing a handle in FIG. 1 is included for the purpose of illustrating the device used with a handle, and forms no part of the claimed design.