Two quests appear to have the same bug or description error.
One from the Druid trainer in Parsinia to kill 5 Gruok. It doesn't say what type and grulets, Gruok sows, Wild Gruoks, and Angry Gruoks do not register as kills.
Likewise the kill 10 Gruoks quest from the Lizardman town (I don't remember how to spell the name, I'm new) marshall doesn't register kills from Grulets, Gruok Sows, Angry Grouks and Wild Gruoks.
Either the description is bad and it isn't any of these types or the quests are bugged.