The Ice Climbers' Target Test Room only has Popo (or Nana depending on the color) and instead of the Target Test music, it plays the Ice Climber music. This could reference the game Ice Climber, as Popo climbs to the top alone (unless there's two players), along with breakable blocks and scrolling clouds. The condor appears holding the last target which is referencing how an Ice Climber needs to grab onto the condor at the end of a bonus stage (which Target Test also is). The targets could also reference the vegetables in Ice Climber that the player needs to collect for points.
Contributed by JelloBoyInc