NPCs composing that spawngroup :

an_ice_goblin (50%)

a_goblin_priest (50%)

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

permafrost_34, range=83 (567,246,17)

an_ice_goblin (50%)
a_goblin_evoker (50%)

permafrost_56, range=72 (519,178,17)

permafrost_101, range=38 (619,140,5)

an_ice_goblin (50%)
a_goblin_evoker (50%)

permafrost_102, range=24 (614,168,3)

an_ice_goblin (50%)
a_goblin_priest (50%)

permafrost_142, range=90 (680,158,-29)

an_ice_giant (100%)

permafrost_151, range=99 (620,261,-39)

giant_wooly_spider (100%)

permafrosta_goblin_priest016171868369, range=79 (512,181,17)

a_goblin_priest (100%)