Apex domains cannot have CNAME records.
Question and response
Question
dig docfro.com. NS
Answer
docfro.com. 5 NS ns-1506.awsdns-60.org.
docfro.com. 5 NS ns-1492.awsdns-58.org.
docfro.com. 5 NS ns-1480.awsdns-57.org.
docfro.com. 5 NS ns-1567.awsdns-03.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0