What is "chiken ramen"? I've heard of "chicken ramen". That is a flavor of ramen, and it does not refer to ramen or instant noodles in general. Is "chiken ramen" a brand name?
I believe that "top ramen" refers to a specific brand of instant noodles, but the term has become generic. Few English speakers would understand "ramen" alone, but most would understand instantly "top ramen".