Nick is a lost TV channel created by Pramer (creator for other channel like Magic Kids) for Argentina. This channel doesnt have any relation with Nickelodeon or Viacom, despite having the same name as the former and airing shows from it. The channel ran from 1994 to 1995.
There are many pieces of evidence, like videos, for example an episode for "Chiquititas 99" where an animated series interrupts the video, which has both, Nick and Boomerang logos.