Wil Wheaton was a popular actor during the later years of the Little House on the Prairie tv show and it’s continuation of Little House: a New Beginning. While today he is popular in both the tech industry and for his role as Wesley Crusher on Star Trek: The Next Generation, Little House was not one of his acting credits.
He did appear in another popular Michael Landon TV series, which is why sometimes people think he appeared in Little House on the Prairie. He guest starred as Max in an episode of Highway to Heaven in 1985.