Does iphone 5C has USB OTG support?

Does iphone 5C has USB OTG support? - 1

No, none of the iPhones are OTG compatible

Does iphone 5C has USB OTG support? No, but
i-Flash Drive, work for iPhone 5/5s/5c/6/6 Plus/ipad. You need to download the device app in order to use it.
http://www.instagadgetsworld.com/products/i-flash-drive-32gb-64gb-micro-usb-pen-drive-lightningotg-usb-flash-drive-for-iphone-55s5c66-plusipad-i-flashdrive-pendrive/
Does iphone 5C has USB OTG support - 1

No. The iPhones do not work with any USB OTG devices.