Here we have some documentation on some tools for managing the clocks:
https://github.com/aws/aws-fpga/blob/f2/sdk/userspace/fpga_mgmt_tools/README.md#clock-management-commands
However the documentation says that the arguments to fpga-load-clkgen-dynamic are "-S -A -B -C ", but that is not what you get out of the -help output. Similarly for fpga-load-clkgen-recipe.