> Do they have "leggo my eggo" itself trademarked?

As a matter of fact, they do:

https://tsdr.uspto.gov/#caseNumber=77021301&caseType=SERIAL_...

The full complaint linked above has a full list of trademarks. There's also a claim for trade dress infringement, since the food truck uses the same font and red-yellow-white color scheme.

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Dylan16807 16 hours ago | parent [-]

However, that particular phrase appears to be trademarked for: waffles, pancakes, french toast

	▲	wlonkly 12 hours ago \| parent [-]
		Skimming the complaint, Kellogg looks to be arguing it is a well-known mark,[1] and is also making a trade dress claim. [1] https://www.uspto.gov/ip-policy/trademark-policy/well-known-...