It had the 'New!' symbol by it. I don't know why.

I dunno what original author meant but there is an animal that goes by similar name, I found is spelled noolbenger or noolbender on some sites:
http://en.wikipedia.org/wiki/Honey_possum

So it might be related or not.

Could be that someone is making new fanfiction and included them as characters. as far as availability goes, maybe they did not finish them yet or they were not approved by mods yet.

Otherwise if you see that was recently posted, just try asking author about it in shoutbox.