Fun fact Iguanodons are much better then the parasaur. In fact they can jump, have Infanite stamina (when run In four legs), can gather Berry's and turn them into seeds! Plus taming them is super simple, you can tame it the same way as the parasaur too! If you don't believe me, then go to the Iguanodon section and read the tips for more info!
I think y’all are making it too hard. I found one by a rock hill, and punched it with my fists until it was unconscious (which didn’t take a long time). I am a noob, I just started yesterday yet picked a hard spawn. I died from the cold, then got tintoberries and came back. It was a super quick tame because it was a low level!! Anyway, it died from a carno while going back to my base. It got it down to 42 hp. RIP new deer friend.