Thank you for the provided example.
The Kendo UI TreeList is a different widget than the Kendo UI TreeView and has different options and functionalities compare to the TreeView.
Unfortunately, the TreeList does not support similar options to modify the tooltip which is shown during dragging.
I can suggest submitting a feature request and based on its popularity we may implement it in a future release:
Also, please have in mind that dragClue is not part of the official public API of the TreeView, and using it may lead to unexpected issues: