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As a non-tcl/tk user except via tkinter, I am not convinced that we should add a near-duplicate function. The *Python* doc for ttk.Style.theme_names says "Returns a list of all known themes." If it does not do that, which it seems not to, it should be changed (whether the change is called a fix or enhancement).
From the referenced Epler post, the situation seems more complicated on the ttk side in that ttk has two similar functions: 'style theme_names', which only reports 'loaded' names, and 'themes' which reports 'loaded and available', though 'available' seems vague and dependent on strange package calls. For Python, a parameter for one function would suffice to restrict or augment the list returned, if indeed the option is needed.
Are 'unloaded but available' themes really available to use? Does Style.theme_use(available_name) work? If so, it seems to me that available_name should be reported by theme_names. If not, what is the use of knowing it?
Most any patch will need a doc patch.