Looks like a bolt head with a hood prop/liftgate prop mount (the ball) or a mount for a ride height sensor rod. A little large to be a Zerk... the pictures are small so I can't zoom in to see much detail.
the bolt is hollow,for greasing..zerk on one end,hole on the other...after more research,..this appears to be what is called a 'wet-bolt'...used on axles..it was nt buried in the dirt,..it was on top of the ground...pretty puzzling
That maybe a "wet bolt" but it is not big enough for spring hangers. Also too many threads on the bolt that would weaken it. Wet bolts have an actual zerk in the end, it is not made into the spring hanger bolt.
I am more inclined to agree with Ford Doctor. It is for some type of gas charged shock mount that holds the hood or trunk lid open.