Jumping in here, they look like they could be a kind of Coachwhip to me... you can check here and see if they look familiar: https://www.google.com/search?q=brown+coachwhip+florida&tbm=isch&source=iu&ictx=1&fir=wb-AjeakYArGnM%253A%252CDbRtgudyHHuaPM%252C_&usg=__WVHKa5Gw6CtZ0DpZ0CMVJQ_Is2c%3D&sa=X&ved=0ahUKEwiyoYfv5KjbAhUIZKwKHTEYCj0Q9QEIMzAE#imgrc=wb-AjeakYArGnM: