Contrary to popular legend, there is no evidence that Benjamin Franklin ever publicly supported the wild turkey (Meleagris gallopavo), rather than the bald eagle, as a symbol of the United States.
You know who else suggested that the wild turkey, not the bald eagle, should be the national bird of the United States? Not Ben Franklin, according to Auntie Wikipedia. Perhaps Dinkle knows this, and he’s delivering the “national bird” remark satirically. This is supported by the fact that he’s smirking so hard when he says it that his mouth threatens to escape his face. But wait, here comes the punchline and…it’s…Butterbald? Hell no, I’ve never heard of a Butterbald Eagle. Or a “Butterbald” anything! Did Batty feel that the good people at Butterball® LLC wouldn’t be OK with a free mention in 400 newspapers right before Thanksgiving? Batiuk’s propensity for coming up with jokey, soundalike “brand names” once again tramples what would have been a borderline decent gag.