NPC Spawn Issue: Froglok raiders in swamp of no hope

[Sik]

I've been unable to get any to spawn, cleared out mobs aplenty.

Was working fine maybe three or more months back, have come here with my druid just to be sure and cant find any on track.

Their usual spawn camp near the marauder camp (approx 3000, 0)

Cleared mobs for an hour or more and no spawns - usually a steady trickle of them.