NPCs composing that spawngroup :

an_ice_goblin (50%)

a_goblin_priest (50%)

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

permafrost_1, range=76 (312,218,-38)

permafrost_8, range=88 (315,291,-38)

an_ice_goblin (100%)

permafrost_19, range=53 (213,198,3)

an_ice_goblin (100%)
an_ice_goblin (100%)

permafrost_30, range=60 (295,220,3)

an_ice_goblin (50%)
a_goblin_diviner (50%)

permafrost_45, range=78 (300,294,17)

a_goblin_wizard (100%)

permafrost_57, range=86 (215,327,17)

an_ice_goblin (50%)
a_goblin_mendicant (50%)

permafrost_60, range=26 (223,264,10)

a_goblin_preacher (50%)
a_goblin_prelate (50%)