I have an actually overpowered way to tame these guys:

1. Make sure you have a cryopod or argy

2. Get a lot of stone doorframes and a stone ramp

3. Find a Gigantoraptor

4. Build a trap with the previous stone stuff

5. Aggro the Gigantoraptor parent into the trap

6. Do the emote thing with the baby in the nest

7. Grab the now tamed baby with a cryo or argy and boom

With this strat, you don’t need fertilized eggs and you don’t have to worry about the adult breaking out of the trap