NPCs composing that spawngroup :

an_ice_goblin (50%)

a_goblin_diviner (50%)

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

permafrost_10, range=98 (125,-318,3)

permafrost_23, range=89 (48,-345,3)

an_ice_goblin (50%)
a_goblin_priest (50%)

permafrost_24, range=59 (50,-315,3)

an_ice_goblin (50%)
a_goblin_evoker (50%)

permafrost_25, range=77 (47,-333,3)

an_ice_goblin (50%)
a_goblin_priest (50%)

permafrost_29, range=32 (49,-288,3)

an_ice_goblin (50%)
a_goblin_prelate (50%)

permafrost_31, range=14 (45,-270,3)

permafrost_82, range=41 (46,-215,3)

an_ice_goblin (50%)
an_ice_goblin (50%)

permafrost_83, range=54 (40,-202,3)

an_ice_goblin (50%)
a_goblin_priest (50%)

permafrost_84, range=68 (49,-188,3)

an_ice_goblin (50%)
an_ice_goblin (50%)

permafrost_103, range=93 (120,-315,3)

an_ice_goblin (50%)
a_goblin_priest (50%)

permafrost_130, range=90 (138,-257,3)

an_ice_goblin (50%)
a_goblin_evoker (50%)