The ornamental design for a strollercartframe, as shown and described.
FIG. 1 is a left elevation view of a stroller cart frame showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a right elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a perspective view thereof; and,
FIG. 8 is a mirror image perspective view of the view shown in FIG. 7.
Broken-lines showings of other elements of a stroller cart, which elements include a foldable child seat, a knob on a push handle, a lower tray and casters, are for illustrative purposes only and form no part of the claimed design.