This is a Gi-Go mold that shows up in Wonder Pony Land (and other store brand) sets. It features a raised front hoof, long torso, and slim legs. There is a light line denoting the hoof outline. Marked L-14-B1 on bottom back hoof. It is a more slender version of L-16-B1. Stands 5.5″ tall.
This mold is usually found with an earth pony head with inset glass eyes.