While it's not as widely used as some other diminutives, it's a recognized and accepted term, particularly in contexts like:
* Fantasy: "He stumbled upon a hidden grove of treelings, their delicate branches shimmering with moonlight."
* Poetry: "The gentle wind rustled the treelings, their leaves whispering secrets to the night."
Other options, though less common, could include:
* Treelet: More formal and suggesting a small, young tree.
* Twiglet: More playful and emphasizing the thinness of the tree.
Ultimately, the best diminutive for "tree" will depend on the specific context and the desired effect.