The only thing I can think of is trying to ride each of the species in Free Play during a single playthrough. If the trophy doesn't unlock then there's a similar thread where some other people have had problems obtaining the trophy themselves.
Thanks again for the reply. I am now down to just getting One trophy Sea Turtles Mate to get the Plat to Pop ( Game Verison 1.01 ). This seems to be a problem with downloading games off the PSN network. I had this problem with Journey which I bought and down Loaded off the PSN. The game would not give me credit for Items I collected in game for Trophys.
I had no trouble with Platinuming LEGO Pirates of the Caribbean myself... but naturally, I did purchase a copy of the game on disc. However, Journey is a game I too have bought through the PlayStation's download service. I've had no trouble obtaining 100% of the trophies in that game. I'm not sure why the trophies aren't working on your end.