I claim the ornamental design for the tent stake, as shown and described.
FIG. 1 is a perspective view of a tent stake showing my new design.
FIG. 2 is a bottom plan view of the tent stake of FIG. 1.
FIG. 3 is a top plan view of the tent stake of FIG. 1.
FIG. 4 is a right side elevation view of the of the tent stake of FIG. 1.
FIG. 5 is a left side elevation view of the of the tent stake of FIG. 1.
FIG. 6 is a back side elevation view of the tent stake of FIG. 1; and,
FIG. 7 is a front side elevation view of the tent stake of FIG. 1.
The broken away symbols in the drawings indicate the appearance of any portion of the article between the break lines forms no part of the claimed design.