yes?
A couch that has one armrest and no backrest, is called a fainting couch.
Divan, Sectional
An otter's den is called a holt or a couch.
Coasters
An otter's burrow is called a Den, Holt or Couch
I think it was called something like the big comfy couch.
Leather couches are low maintenance and resist spills and stains easier than a fabric couch. Be careful with ink pens and sharp edges that can scratch or cut the couch. Invest in a leather repair kit if purchasing a leather couch.
A couch (settee, sofa) is called 'un canapé' or 'un sofa' or 'un divan' in French.
Couch potatoes
You are most likely thinking of a futon. Sometimes they are called a folding sofa bed, sleep sofa, sleeper couch or sleeping couch. Ones that have a metal folding mechanism are called click clack sleeper sofas.
Couch bags can be purchased at a superstore, or online. They also may be available at thrift shops or second hand stores. They are also remarkably easy to craft in one's home at a low cost, relative to other furniture.