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Hollow things are common, and of interest to many animals. If I thump a log and it makes a noise like it has a hollow space (low tones), then it may contain an animal nest or a beehive & honey, or it may be something I could use as a box or basket or shelter.

Scratch a thin pointy branch across e rock -> sharp high noise.

Thump a round club/log against a rock -> dull bump noise

Thump two round rocks together -> sharp noise

Thump pointy branch against a tree -> dull noise

And chickens aren't using tools.

They're scratching for gizzard stones and food though, with their built-in beak, fwiw

I challenge you to find two objects of a similar size and cut them into shapes that would produce a sharper sound for the rounder object.

In your example it's obviously the round tree trunk that produces the dull sound.

Maybe animal sounds count? Warning sounds tend to be loud, sharp, and high-pitched; and when ignored, they might end with more material sharp things in your skin. I can't recall any animal with a soft warning sound.