Not much is known about them because not much was said about them.
It's a travesty when characters like this are created with very little creativity. If they had to be approved by the creative team...well, they just wouldn't be. I've seen way better fan creations on these boards and have no interest in Golden Rod (*stifles a laugh*) or Snarrrllll the Snow Thief (why steal snow? What good is that to anyone?).