this might be irrevelant but hear me out first..
Lore: The Chaos Empire and their troops were travelling through the savanna (the African plains) and on the way they found the united tribes with giants wearing dinosaur masks, surprised, they went to a triceratops skeleton and the Marrowkai used dark magic to revive the flesh, muscles the teeth and it gave it one objective and that was to work for the chaos empire and they saddled it and had knights with bolas.
Uses in game: The triceratops does the main damage by bashing units and the knight throws bolas to stun units for 10 seconds like the boyers trap. and please add a name for it in the comments i am out of ideas