NPCs composing that spawngroup :

an_ice_goblin (100%)

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

permafrost_17, range=81 (293,215,-38)

an_ice_goblin (50%)
an_ice_goblin (50%)

permafrost_38, range=57 (218,141,3)

a_goblin_evoker (50%)
a_goblin_priest (50%)

permafrost_47, range=89 (302,197,3)

an_ice_goblin (50%)
an_ice_goblin (50%)

permafrost_49, range=58 (228,141,3)

permafrost_53, range=84 (295,220,3)

an_ice_goblin (50%)
a_goblin_diviner (50%)

permafrost_59, range=46 (210,244,10)

an_ice_goblin (50%)
an_ice_goblin (50%)

permafrost_60, range=66 (223,264,10)

a_goblin_preacher (50%)
a_goblin_prelate (50%)

permafrost_61, range=53 (240,244,10)

an_ice_goblin (50%)
a_goblin_priest (50%)