No, one is never found at trial to be innocent. One may be acquitted or found "not guilty." That's a very important, technical distinction. What the trier of fact determines is whether the prosecution has met its burden of proving you guilty -- not whether you are legally (and morally) innocent or without fault. This means that an acquittal of a criminal charge is not a defense to a civil lawsuit arising from the same incident.
This is a great point here. One important thing I would add to this is that when public opinion is taken into account, you'll hear people say, "He was found not guilty, but that doesn't mean he was found innocent". But it actually does! The reason is because a person is presumed to be innocent unless proven guilty in the court of law. So, "not guilty" means that he's still presumed to be innocent. Too bad the general public doesn't see it that way.