The best Thanksgiving Day cartoon I can think of is this one, directed by Tex Avery in 1945 and — for some reason — released not in November but in April of that year.
Hey, you wanna know about the voice credits? Well, they're a bit of a mystery. A lot of folks think the main pilgrim was voiced by Bill Thompson, better known for voicing Droopy…but Bill Thompson was away doing military service when this cartoon was made. It's really someone imitating him and the question is who? Tex always claimed that he did Droopy's voice when Thompson was unavailable and maybe that's him playing the pilgrim guy. Or maybe not. Meanwhile, most experts have identified the turkey who sounds like Jimmy Durante as having been voiced by Wally Maher, better known as the voice of Screwy Squirrel — and perhaps it is. But I think it might be Frank Graham, who is clearly heard as the "half breed" character.
If these names mean nothing to you, just ignore the above paragraph and enjoy the cartoon…