That name cracks me up.
Once I Was Butter.
Butter-ish.
Yellow Semisolid
A store I used to shop at regularly had 1 called “is it butter?”. No capital letters, IIRC.
‘Butt’
Tag line: It’s not quite butter.
The standard butter knock-off in Canada is “Becel.”
The generative knock-off of the knock-off? “Cebel.”
One day at dinner I asked, “Could I please borrow your I-can’t-believe-it’s-not-a-butter-knife?”
The Official ‘Butter’ of the American Margarine Federation
Pravda Butter
God Told Me This Is Butter
Small Print Industries Fake Butter
The Diet Coke of Butter
Facsimile of Churned and Solidified Bovine Mammary Secretions
I can’t believe it’s palmitic, oleic, and myristic glyceride with water!
Buckfutter
Brummell & Brown Spread, with yogurt. (Yogurt? The only buttery thing about yogurt is…buttermilk. And that ain’t very buttery.)
Not only is there the yogurt issue, I despise fake people-names for products. Then there’s the word “Brown.” Nothing purporting to be a dairy product should be “Brown,” unless it’s, like chocolate. Or gjetost.
Hmm…there is one girl that everyone in the office calls Margarine instead of Marjorie.
But I haven’t been working here long enough yet to work out why…
Reminds me of a great scene from The Vicar Of Dibley - “Well, I can’t believe I Can’t Believe It’s Not Butter and the stuff I can’t believe is not I Can’t Believe It’s Not Butter are not butter, and I believe that they both just might in fact be butter, but in cunning disguises, and in fact there’s a lot more butter out there than we believe.”
Butteresque
No can has butter?
yo gart butter
translation: you got butter 
Brummel & Brown® Spread I think it’s actually very good.
Richard Jeni Starts at 3:15
I can’t believe it’s nut butter.
Move Over Butter. (whipped buttermilk) I like this stuff quite a lot.
Some I’d like to see:
Butter Dead Than Red!
Things Go Butter With Coke (a form of coco butter, or possibly cocaine butter)
Butter Homes and Gardens