No you can’t use another brand’s name. Those are trademarked and you would be sued if you tried without getting a license
You can call it “toffee” but you can’t use another brand name
The only exception would be if you were some big company who uses a brand name product mixed with your brand. In that case you would have to sign a contract with the big brand and pay them a licensing fee for every item sold if you used their name. So if you wanted to create a milkshake company and you had a “Snickers Milkshake” then you would need to sign a contract with M&M Mars allowing you to use the Snickers trademark, and pay them a royalty or licensing fee — either an annual fee, a monthly fee, or a % of every item sold

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