The ornamental design for a lawngroomingdevice, as shown and described.
FIG. 1 is a top right perspective view of a lawn grooming device showing my new design in use condition.
FIG. 2 is an enlarged top right perspective view thereof.
FIG. 3 is a top plan view thereof.
FIG. 4 is a bottom plan view thereof.
FIG. 5 is a front elevation view thereof.
FIG. 6 is a rear elevation view thereof.
FIG. 7 is a left side elevation view thereof; and,
FIG. 8 is a right side elevation view thereof.
The broken line showing of a roller and surface features in FIGS. 1–8 and the broken line showing of a second lawn grooming device and a mounting structure shown in FIG. 1 is for environmental purposes only and forms no part of the claimed design.