In 5th edition, mounted combat with a controlled mount limits the actions of your mount into the Dodge, Dash, and Disengage actions. However, what about charging at someone and trampling them? Intuitively, it seems like it should be possible. However, I can't find any rules to support this, or any to provide support for a reasonable ruling.
There is a similar question but without an accepted answer of the more general case, in which it is asked if the mount can attack while being ridden. This question is more specific in that I am asking if you can have the mount trample someone while you are controlling it (so it does not have its own initiative).