There is no Mini-ITX for Threadripper, but there is MicroATX already - HWCooling.net
Used Mini-itx For Asus Rog Strix X570-i Gaming Motherboard Socket Am4 For Amd X570 Original Desktop Pci-e 4.0 M.2 Mainboard - Motherboards - AliExpress
Mini ITX for AMD Ryzen Threadripper. : r/pcmasterrace
MSI MPG B650I Edge WiFi Gaming Motherboard (AMD AM5, Mini-ITX, DDR5, PCIe 4.0, M.2, SATA 6Gb/s, USB 3.2 Gen 2, HDMI, Wi-Fi 6E, AMD Ryzen 7000 Series Desktop Processors)