Elder Turntusks says: " We are proud to call ourselves the last tribe of Forest Trolls to serve the Horde. In time, we will overcome the other tribes, and the dwarves, and the Hinterlands will be ours. "
https://wow.gamepedia.com/Elder_Torntusk
" The Horde has done much for us Revantusk, and we’re no freeloaders. With the other forest troll tribes pushed back, we’re striking out to claim more land in the name of the Horde. But now the Wildhammer dwarves are getting in our way. If it’s a war they want, it’s a war they’ll get… and I don’t plan to lose a war to creatures half my height. Get out there and kill me some dwarves. "
https://wow.gamepedia.com/The_Savage_Dwarves
Primal Torntusks said:
“Today we make the first strike at the heart of the savage Vilebranch tribe. Show no mercy, ; this is no longer just a spat between trolls. Every victory of the Revantusk is a victory for the Horde! The Vilebranch headhunters and witch doctors will be the first to go. Make your strike against the lower terraces and report back to me with blood on your weapons.”
https://wow.gamepedia.com/Start_Taking_Back
"Only the strongest and foulest Vilebranch are left now. The soul eaters and blood drinkers, foul worshippers of the evil god Hakkar.
They are FOOLS! They cling to old, defeated beliefs. I won’t tolerate their crimes against the Revantusk any longer.
Strike the final blow. Claim Jintha’Alor for the Revantusk… claim it for the Horde! "
`https://wow.gamepedia.com/Primal_Torntusk`
They are even using Horde flags / banner in their village and using Horde tabards battling against the Wildhammer Dwarves.
https://www.wowhead.com/npc=42536/revantusk-stalker
Their text make it rather clear they vie themselves as members of the Horde. They want to conquer for the Horde.
The Revantusk Speaker in BFA are talking about friendship to the Horde.
https://wow.gamepedia.com/Revantusk_Speaker
How can they not be a option for players? They clearly are fighting for the Horde. The Revantusk are loyal and take pride to “serve the Horde”.
They need to become a customization option for Trolls.