But, regardless, it seems that a chicago potter is claiming first dibbs on the commercial use of the phrase. Sincerely, both of them should get attorneys who know what they are talking about, and have those attorneys explain what a trademark actually is. The trademark identifies the goods. The trademark is not the goods. This attempt to try to use trademark as a way to copyright a short phrase is silly at best.
From the US Patent and Trademark Office:
A trademark is a word, phrase, symbol or design, or a combination of words, phrases, symbols or designs, that identifies and distinguishes the source of the goods of one party from those of others.