Is it just me or are the hagspawn roughly copied on Creature Collection 2's Haglings ?
(Well, technically, haglings are normal children distorter by hag magic, while hagspawns, with a name like that, are probably the actual offspring of hags. Still it's pretty close.)
As for the censored race, it's probably not Star Elf. Why would they censor its existence if they aknowledge it in the region part ?
The censored race is probably something wholly new to WotC D&D 3e. Maybe an all-new creature, so that a mere name would not be much enlightening ("Blurgblurg ? What the heck is a blurgblurg ?"). The other possibility would be a conversion of something from an older edition (before Gnoll ? the Flumph ?), but then why censor it, when the Taer is mentionned ?
So, I would say it's useless to speculate on what the mystery race is, as I think it's not something we know.