You get trophies from booster packs (ie. Grizzly pack, Aztecosaur pack) They have almost no use that I am aware of, except that they sell for some good coin at Free Traders. Hope this helps!
Misty, 70 Zoe, 36
I'm sorry, The Stalwart Queen, but you're mixing up Treasures for Trophies ( easy to do, I know ). The icons for these two items are entirely different. Treasures come in booster packs, trophies have yet to show in the game.