Looks like they are! I was always told that a horse shouldn't begin jumping until they were around 5 and were almost done growing. This makes me sad :(
Not good, as said above would report them if they were in my part of the world. Why do people do this? Whilst we were looking for a pony for our daughter i saw many 2 year olds advertised as jumping coloureds etc, needless to say we didn't view any of them. The health problems that they will have later in life will be terrible.
But don't young horses buck around and play and jump anyways? I'm not supporting lunging a foal over jumps, but don't they put that sort of strain on their limbs themselves?