I created a donor advised fund in 2016, but did not fund it until 2017 can I deduct this amount as though I made it in 2016?

Does your bank statement show the money withdrawal having left your account in 2016?

no

Then you only have a 2017 contribution. Even if the money did leave in 2016, it would be questionable.

Sorry, but you cannot.  Charitable contributions are only deductible in the year paid.