I only found one Thanksgiving picture in my files. It's this turkey from Dover Publications. If you click on the link, it will take you to their home page. They have all kinds of publications, including clip-art. You can sign up to get Free Sample images that can be used in your own creations. They also have some amazing sales on books of all kinds.
You just click on the image to enlarge it, then right click and save to your files.
I hope you enjoy using these in your own art projects. There are a few other images I offered in the past. Just click on the Free Images label below to see them all. Any images not marked as free are owned by me, or used with permission of the owner. Please honor my copyright on all other photo's, images, and writing.