Looking for External CAN FD Controller with SPI Interface
Have a look at the MCP2517FD external CAN FD controller IC.
If you are interested in MCUs with built-in CAN FD controllers, our SAM5X Family, as well as the SAME70/V70/V71 Series, support CAN FD. We recommend you take a look at our "PIC32 and SAM MCUs with CAN Quick Selector Guide" to learn more.