In Carpenters Landing those drops both sleepshroom and woozyshrooms. But woozyshrooms drop rate seems higher. After 3 hours killing in Carpenters landing I gathered stack of woozyshrooms and only 2 sleepshrooms.
Edit: In Carpenters' Landing those link as well, but seems range quite short. Got link only once, after that managed nicely without them.
They're supposed to be easy at a certain level but GOSH... what a pain with their poison... I usually lose 120 out of 280 hp AFTER the fight when poisoned...