fat out
It is a brand name, but Drano rhymes with Plano. Not sure that will fit into a poem or song, but at least it rhymes.
brand new
champagne
watch? blotch
How can i find my watch by serial number and brand
Molson (beer brand)
hopscotch, crotch, watch
Seiko is a watch brand beginning with S. Another one is Skagen.
Well you could say a florist.
agnostic Bostik (name of a brand of glue)
Notch, blotch, hotchpotch