yes, this site says Fangslayer and others are also offspring of Freefoot...
I'll finish the list with what the site says... some are (very) doubtful...
also, there's something with Goatriders in the story about Freefoot... very strange.
Droomzanger = Dreamsinger (Skyfire's Recognized. Strange elf (non-Wolfrider), got murdered by Stonethrower.)
Doornbloem = Thornflower (Mantricker's Recognized, check.)
Havikvanger = Hawk catcher (son of Freefoot)
Maanzilver = Moonsilver (partner of Two-Spear, mother of Sharptongue)
Nachtster = Nightstar (no translation given, daughter of Skyfire, brother of Freefoot)
Samael = Samael (no translation, father Greywolf)
Scherptong = Sharptongue (no translation, son of Two-Spear&Moonsilver)
Stormlicht = Stormlight (no translation, mother of Goodtree, check.)
Tweeschauwen = Two-shadows (Freefoot's Recognized)
Veder = Feather (son of Freefoot)
Verscheurder = Fangslayer (son of Freefoot)
Vries = Frost (no translation, mother of Greywolf)
...scanning through some character's pages... Goodtree didn't Recognize both Lionleaper and Acorn, did she? (site says so...)
*edit* WTF... says Joyleaf's bondwolf was named Preytracker... screw you! She had Shadowsheen!