Final answer:
The group described is Culture Club, known for their hit songs such as 'Karma Chameleon.'
Step-by-step explanation:
The group described in the question is Culture Club. Culture Club is a famous 1980s pop band fronted by Boy George. The double-decker creation with bacon, lettuce, tomato, and turkey on three slices of bread is a reference to a famous sandwich called the BLT (Bacon Lettuce Tomato). Boy George's group, Culture Club, is known for their hit songs such as 'Karma Chameleon.'