There are quests that require these emotes which can be exchanged on Freedom Isle by Blackfang (non-rapport). Each taunt is worth 3360 Gienah’s Coin. Note that the Blackfang on Blackfang’s den would be the NPC for rapport.
Fermata’s Model (Fermata)
Fermata is similar to Peyto (a huge ship) located northwest of Vern. Use the /taunt emote to finish the quest leading to the Island token.
Time for a Takedown (Peyto)
Peyto (similar to Fermata) is located west of Anikka and east of Vern. Use the /roar emote to finish the quest leading to the Island token.