A_662 - In general, it's incorrect to use the term "fat" to refer to a type of plant that we might call "thick". The word "fat" has also been associated with meanings that imply the need to lose weight, etc., as well as a derogatory connotation that those plants don't need, and thus creates a particular confusion that should be avoided. Personally, I would suggest using the word "thick" instead of "fat".