[cypher]

That hammock thing on Amazon definitely isn't safe.
The first two bird toys might be ok, it does depend on what kind of string is used in case it gets chewed & ingested or caught around little feet, the third, netting thing I would say definitely no, same goes for the fourth, both look like traps for feet which could cause a nasty accident, the last one might be ok although I'm not really sure if a ham would use it.