



 
Hi Sally, A nonmathematical term might be "squashed box". You could take a square cardboard box with the bottom and top removed and push it down to skew it into a rhombus. Stephen La Rocque.> Hi Sally, As a math consultant in elementary schools I spent a lot of time in classrooms with students. Most schools have pattern blocks where 2 of the figures are rhombuses. Some students  all the way up to high school  will still insist on calling them diamonds, but many students, even in K will gladly learn the new word, especially if they are told it's a new word that most people don't know  the same with trapezoid. In K, they may not remember the word but will recognize it Good luck!
 


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