Spritz-Duell

Spritz Duell is water game to be played in a bathtub or a swimming pool, though it could be played in a sink as well. The "board" is a round plastic ring with a net attached. This is placed in the water and four flowers each of red and yellow are placed inside the ring floating. On "go", two players fill up their squirting animals (purple and green hippo-dino looking things) and squirt water into the opposing player's flowers, trying to sink them. The first player to sink the other's flowers wins.

There is another game on BGG called Spritz Toor, and based on the description it sounds like this one but with a Football theme.