these arnt my favourite but they are stoner rap songs.
luniz - i got 5 on it
Krayzie Bone- Smokin Buddah
kottonmouth kings - kings blend
kottonmouth kings - bad habits
kottonmouth kings - bong tokin alcoholics

not really stoner rap but...

2pac - Ghost
2pac - hail mary
2pac - toss it up

anything from pac is good