Push polls are a standard tactic. I’m sure The Don uses them too.
If Trump pulled any of the crap like what Cruz did on caucus night it would be all over the media and FR. That probably hasn’t happened because Trump doesn’t have a sleaze bag like Jeff Roe working for him.
Trump doesn’t do polling. He relies on the other candidates’ polls to save money. He said it would be stupid to pay for something that someone else is paying for.