The Flowerpicker clan was an easter egg in Warcraft II: Beyond the Dark Portal. It was the stored name for the blue orc (Player 2), but since the blue orc slot was never used in a campaign mission as an active player, the name never appeared in-game, though the text string for its title still appeared in the game's data files.
Indeed, unlike the clans in Warcraft II: Tides of Darkness, the Beyond the Dark Portal clan names only appeared in the single-player campaign, and not in custom games. Thus, while the unused Alliance and Horde teams in Tides of Darkness - the yellow team labelled "Horde Traitors" and "Alliance Traitors," respectively - were visible to players despite never appearing in the campaign, the unused blue Horde team's name never showed up without mining the datafiles.
In Warlords of Draenor
This section concerns content exclusive to Warlords of Draenor.
During the World of Warcraft: Warlords of Draenor beta, players could come across a ("A mysterious flower from a mysterious orc") in various zones. Interacting with it would elicit fearful responses from nearby Iron Horde mobs, and in some cases would cause a Mysterious Orc to spawn, stab a nearby Iron Horde mob and then vanish, with the dying soldier yelling "The legends are true"!. This was likely an homage to the Flowerpicker clan. However, the flowers and related events were removed prior to the expansion's release.