chop steak vs chopped steak

chop steak and chopped steak both are nouns.

Word	Noun	Adjective	Verb	Adverb
chop steak	Yes	No	No	No
chopped steak	Yes	No	No	No

As nouns, chop steak and chopped steak are synonyms defined as:

Other synonyms of chop steak include beef patty, chopsteak, hamburger steak.

chop steak (noun)	chopped steak (noun)
a patty of ground cooked beef	a patty of ground cooked beef