There is no such thing and as advised they will be stunted and not very attractive fish. All Arowana get huge at least 30''+, i sold my RTG as it was 23'' and my tank was only 24'' wide and 6' long.
Can you show us pics of asian aro's with the size you claimed above? You're knowledgeable in this department so I'm sure you didn't say it without some basis.
And there are short bodied aro's from deformity but not stunt...
My dwarf arowana.. actually I rescued her. She was kept with African cichlid that bite of her tail. When she was a juvenile.
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short bodied...not dwarf. Maybe that's what you're looking for. And Short Bodied Asian Arowana are much more expensive then the normal ones.
They're called Fa Fu Long in Asia.
How expensive? do you know how big they get? how do people make fish so that they have shrt bodies?? seems really harsh