Dracovenator

But elephants could also use their trunks to pickup objects

That would be useful

then let's just use mammoths and update them.

Marine iguana rider 1.jfifMarine Iguana would be an excellent option with a water buff excellent oxygen and swimming and is also good on land would be passive and tameable passively with Azulberries or add a new plant seaweed

Could lift up trees and could use it trunk to pick up objects, he could have a platform saddle and be found in desert and arid savanna and would beat the mammoth cause of the functional trunk