There may have been a Brachiosaurus, but it was different from the one in the screen cap. I own two versions of the Dilophosaurus. They are different than the dinos in the film. The Trike you have has different eyes, a completely different color scheme (both sizes in the film are pink or red), and the different horns you mentioned. In addition, your tag says Amblin, and a quick ebay search confirmed that these are indeed from Applause. These plushes are cool and are official JP merchandise, but they are not screen accurate, and aren't the dinos in the film.
You are correct that there was supposed to be a baby Trike in the film that got cut. I believe it ended up in a shot in TLW in one of the cages.