This forum requires card tags. [c]Yarok, the Desecrated[/c] = Yarok, the Desecrated. And "Transform" cards are ones that Transform. IE, say the word Transform on them. Like Huntmaster of the Fells. It sounds like you are not asking about Transform cards. You are just asking about cards that copy things.
In regards to Clone and Mirrormade: they do not have inherent triggers so they do not, by themselves, interact with Yarok. They have replacement effects that apply as they enter the battlefield. That being said, if they copy anything with an Enter the Battlefield trigger, it will be just like a "normal" one of those permanents enter and you will get double the triggers. Say your Clone copies a Wall of Omens. You will get two Wall triggers because it enters as a Wall and Yarok makes it trigger an extra time.