Here's a list of CPU coolers with confirmed Ryzen Threadripper compatibility | KitGuru
Bykski For Amd Ryzen3000 Ryzenam3/am3+/am4 1950x Tr4 X399 X570 Cpu Water Block Fan Cooling Copper Radiator Water Cooler Cooling - Fans & Cooling - AliExpress
An AIO That FINALLY Cools AMD Threadripper - Enermax Liqtech TR4 - YouTube