Tyrannosaurus rex: https://youtu.be/OG_RgYHCRz0
Giganotosaurus: https://youtu.be/cAW2RF3Chms

0:00 - Dreadnoughtus
0:15 - Quetzalcoatlus
0:29 - Ankylosaurus
0:32 - Pteranodon
0:48 - Oviraptor
1:06 - Nasutoceratops
1:19 - Moros
1:31 - Iguanodon
1:33 - Cretaceous birds
1:38 - Unknown

Brachiosaurus sounds (slow-downed donkey calls) were used for the Dreadnoughtus sounds.

The sound of vultures were used as the vocal effects for the Quetzalcoatlus.

Audio recordings of a Tiger moaning with mouth closed were used for the Ankylosaurus bellowing.

The Pteranodon vocal effects were created using audio recordings of an otter, happily screeching about the feeding time. They are reused sounds from Jurassic World.

Oviraptor's vocal sounds are probably a combination of bird noises.

Some of Nasutoceratops grunts came from pigs. Most of the sounds were reused from Battle at Big Rock (https://www.youtube.com/watch?v=d6hS_0o_Yjc)