NPCs composing that spawngroup :

an_ice_goblin (50%)

a_goblin_priest (50%)

NPCs spawning around that spawngroup :
(Max range : 100)

permafrost_26, range=57 (75,-156,3)

an_ice_goblin (50%)
an_ice_goblin (50%)

permafrost_27, range=77 (106,-161,3)

an_ice_goblin (50%)
an_ice_goblin (50%)

permafrost_28, range=70 (95,-158,3)

an_ice_goblin (50%)
an_ice_goblin (50%)

permafrost_29, range=86 (49,-288,3)

an_ice_goblin (50%)
a_goblin_prelate (50%)

permafrost_30, range=54 (48,-256,3)

an_ice_goblin (50%)
a_goblin_diviner (50%)

permafrost_31, range=68 (45,-270,3)

permafrost_82, range=14 (46,-215,3)

an_ice_goblin (50%)
an_ice_goblin (50%)

permafrost_84, range=16 (49,-188,3)

an_ice_goblin (50%)
an_ice_goblin (50%)