The Pirate Bay (TPB) is one of the oldest and most resilient BitTorrent indexes. “Knaben” (German/Dutch for boys or lads ) might refer to teens or young users searching for content.
If you meant (possibly a typo for Knaben as in "boys" in German/Dutch, or a misremembered release group name), no widely known torrent release group or notable scene release goes by that exact name. pirate bays knaben
If you meant a general review of as a torrent index for “kids/teens” (Knaben): Useful review: The Pirate Bay for younger users The Pirate Bay (TPB) is one of the