Sadly I don’t think they sell them anymore. The last time I looked Avatar still sold icicle lights, but the images did not look the same. They looked like a copied twinkly style. If you are just looking for xLights control you could buy the Twinkly brand icicles, as twinkly does interface with xLights. I don’t think they work with WLED though.
Chances are that any of the random branded ones on Amazon are not individually addressable. Last year I did try another set from Amazon that looked promising and was on sale super cheap. Sadly it turned out that they were just a bunch of short strings connected in parallel. (pixel 1 of each drop all did the same thing, 2’s were all the same, 3’s all the same…etc.) I sent them back. They were these: Amazon.com: [APP& Remote Contrl] Smart Halloween Icicle Lights Color Changing Icicle Lights with Timer 33.7ft 420LED 80 Drops Halloween Lighting for Roof, Music Sync, Outdoor Holiday Lighting for Tree, Porch : Patio, Lawn & Garden
Ray Wu’s factory store on AliExpress does offer some different options. https://www.aliexpress.com/store/1100403118/pages/all-items.html?sortType=bestmatch_sort&SearchText=icicle&shop_sortType=bestmatch_sort