Huh, so it's an official name for our fantastic five? Would love to see it used in a future film!
No it is not. For all I remember Adam coined the term.
I forget what happened to them. I do recall it was a more primitive board where you didn't have to be registered to post. Unfortunately, this led to an incident in which a member was impersonated and...well let's just say it go well and leave it at that. It was at least all fixed up and the damage reversed. This is based off what I remember being told, so I might be remembering wrong.
Nope, that was the
N54 land before time Forum which is still "technically alive" with me keeping the spam out of a board that I consider kind of a historical source.

N54 is for all I know the oldest existing internet forum on the land before time.
Treestars was the direct predecessor of the Gang of Five and already shared many of its features and structures. I'm not sure if it was created in late 2002 already or only in 2003, but when the GOF was founded in fall 2004 it took over. Few of us were already active on the treestars forum. Adam, Nick, WR I think... not sure if there was anyone else there at the time already.
Another old land before time forum that I want to mention here "in memoriam" was created back in 2001 or 2002. It was Zaroff's land before time forum and was not founded by a member of the GOF. I think that one was the first with some structures comparable to the GOF, but I'm afraid it is gone.
Apart from that there were like two or three land before time groups at Yahoo back in 2001 or so. I had founded one of those, but none of them ever really took off.