This is just a guess since I can't see the full head detail, but I believe it is a Hognose snake (Heterodon Platyrhinos). It is non-venemous but does have some physical characteristics of the copperhead. They are known to play dead when threatened. I used to see alot of these as a kid in South East Texas. Initially they would scare the Begeesus out of you, then we took them home to scare Mom.
