Dinosaurs with hollow bones and three claws and digits on each limb are widely classified as theropods. Interestingly this includes both herbivores like Therizinosaurus cheloniformis and Troodon formosus and carnivores like Tyrannosaurus rex and Velociraptor mongoliensis.
While the exact size can’t be determined, Giganotosaurus carolinii, Spinosaurus aegyptiacus, and Tyrannosaurus rex are among the largest theropods in existence.