Is this onomatopoeia ok?
I could hear the tree nuts tinkling in the wind.
What other possibilities come to mind?
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I agree with the comment left by Crazy Eyes. When I think of tinkling, I think of small bells or wind chimes. (Have a listen to some tinkling on YouTube.)
As for nuts in a tree, I would use a similar word – clicking:
I could hear the tree nuts clicking in the wind.
You can hear various mechanical clicking sounds at this website.
Since you are looking for something innocent, how about:
The tree nuts gently rustled as they swayed to and fro in the breeze.
though tree nut is an awkward construction.
Perhaps the tree's fruit or the nut's hanging within the tree.
But do not use: "the tree's nuts" as nuts refers to testicles very often and all innocence or anything else would be lost to a cheap gender joke.