an 'ugly duckling' that has become a beautiful swan [=an ugly/unsuccessful person or thing that has become beautiful/successful]
The house is an 'ugly duckling', but it has a lot of potential.
roast 'duckling'
(..) Rapunzel? Rapunzel! RAPUNZEL! I know it's around here, somewhere. Ah, there it is. The Snuggly duckling. Don't worry, very quaint place, perfect for you. Don't want you scaring, and giving up on this whole endeavor now do we? -Well, I do like duckling. (..)2010 Tangled