Barring a more specific term or Anglic based coinage, any crab or crablike creature could get the blanket moniker 'amshuusharaag' ('shell-dweller'). A rich or fatty filled wrapping might be called a 'luumagumek'. Putting that together, with a slight case adjustment, gives us 'luumagumekgi amshuusharaag' ('shell creatures wrapped in a rich casing').
There's also 'raasder', for lobster; but that's less precise.
A little more basically, you could keep Rangoon as 'ranguun', and (I think) turn it into 'ranguun aame' ('the way it is done in/in the style of Rangoon', more or less). So then you could get 'ranguun aame amshuusharaag', or 'ranguun aame raasder'.