The link above lacks instructions for creating the Live USB from the Mac, but I believe “Disk Utility” has a “restore from ISO” function that can write the ISO file to a USB key.
Alternately, I recall liking UNetbootin. Scroll down a bit here if you prefer to skip the commnd line answers - there’s plenty of graphical tool options, too:
Nice. I would start by testing it with a Live CD.
https://itsfoss.com/linux-mint-live-usb/
The link above lacks instructions for creating the Live USB from the Mac, but I believe “Disk Utility” has a “restore from ISO” function that can write the ISO file to a USB key.
Alternately, I recall liking UNetbootin. Scroll down a bit here if you prefer to skip the commnd line answers - there’s plenty of graphical tool options, too:
https://superuser.com/questions/63654/how-do-i-burn-an-iso-on-a-usb-drive-on-mac-os-x