USB 4.0 Type-C 10G Ethernet Adapter, for High-Speed Network Connections, RJ45 Port Supports 10Gb/s, 5Gb/s, 2.5Gb/s, 1Gb/s and 100Mb/s Base-T
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comex on hackernews4d
Not only 2.5GBaseT. I have a 10GBase-T Thunderbolt dongle (from [1]). Okay, it's a little bigger than a normal dongle, and it has a USB-C female port instead of a builtin cable, and it gets warm. But it's basically a dongle, and I can get 9.4Gbit/s through it with iperf3 on my Mac.
Unsurprisingly, it shows up as a PCIe device.