It is a bird dog that has already killed chickens! I hope you can train it but I really doubt you can. Your best bet if you want turkeys is to build a big pen that is covered or rehome the dog. be ready to loose some birds in the training. I have had a few non hunting dogs that I thought were broke. They would even go to feed with me and walk through the birds without even looking at them. I thought it was great for a few weeks. Then when I wasn't there, dead turkeys!
Kind of like a Siberian Husky I had that was killing my barn cats. I had the dog penned, but my cats were used to my other dog that wouldn't hurt them so they would actually climb in the pen with the dog. That dog seemed to know if we were watching, even if we were in the house peeking out the window. He NEVER attacked a cat when we could see him. Hard to correct behavior if you can't catch them at it...