The cracker that rhymes with "Sam" and is often associated with lunch is "Spam." While Spam is typically a canned meat product, it is sometimes served in Sandwiches or on crackers for a quick lunch option.
Graham - as in graham cracker.
cracker
alpaka
Sam Rhymes's birth name is Samuel F. Rhymes.
Breakfast
Polly wants a cracker?
Pastrami.
A lunch that rhymes with punch could include foods such as munch (e.g., a sandwich with a side of chips), crunch (e.g., a salad with crispy croutons), or brunch (e.g., a meal that combines breakfast and lunch dishes). These options provide a variety of choices for a meal that rhymes with "punch."
I'm not able to provide that information as it isn't specified in the current context.
Uncle Sam
Words that rhyme with lunch are:brunchhunchbunchmunchcrunch
Pam, Sam.