Salivatrix

The Salivatrix is a treasure found in Pikmin 2 and is actually the cap for a  yogurt bottle. It is found on sublevel 6 of the Snagret Hole located in an alcove, and may be behind a gate. Make sure to use Blue Pikmin and deal with enemies such as Burrowing Snagrets if necessary.

On the cap it reads:

DANNON

FRUIT ON THE BOTTOM

Same Great Taste!

In the Switch port, the treasure is an unbranded yogurt bottle cap.