It sounds like you're describing pond ornaments! These are decorative objects placed in ponds for aesthetic purposes. They can be made from various materials like:

* Stone: Rocks, pebbles, boulders

* Ceramic: Sculptures, frogs, turtles

* Metal: Metal sculptures, wind chimes

* Plastic: Fake plants, ducks, water features

These ornaments don't have roots, leaves, or flowers because they are not living plants.

Let me know if you have any other questions!