I'll assume that you're talking about Linux. (which frequently comes as ISO downloads).
and the answer is no, there is no way to mount an ISO file at boot.
the best that you could do is extract the file to a USB drive and boot from a USB drive to install the OS. (assumng your mainboard supports this).
I didn’t fight my way to the top of the food chain to be a vegetarian…
Im sick of people saying 'dont waste paper'. If trees wanted to live, they'd all carry guns.
"The inherent vice of capitalism is the unequal sharing of blessings; The inherent vice of socialism is the equal sharing of miseries."