The term 'Fleshy Mushroom' can be broken down into two crossword solutions: CEP (3 letters) and CEPES (5 letters). CEP is an acronym for the French word 'Champignon de Paris, ' which translates to 'Mushroom of Paris.' CEPES is the scientific name for the species of mushroom known as the 'Penny Bun, ' which is a type of edible mushroom that is found in Europe, North Africa, and parts of Asia.