Yes, there are dwarf Jakfruits.
Unlike Human midgets, dwarfs, normals, and giants, who stop growing within very specific narrow ranges, PLANTS USUALLY DON'T STOP GROWING AT A SPECIFIC SIZE, until they start to die back.
Dwarf plants have a SLOWER GROWTH RATE, usually with short, compact growth flushes, and with few growth flushes per year (often only one).
The famous dwarf mango, 'Julie', takes 50-80 years to get two stories tall.
The infamously too vigorous 'Valencia Pride', can get two stories tall in about 4 years.
I have a jakfruit that took about 20 years to get 18 feet tall, pruning only dead or sick branches--- I finally cut it back last year, before Hurricane Irma. I get about 8 small, edible Jaks per year. I don't consider it to be good quality.
So when asking about a dwarf, one should ask, "How big does this variety tend to get in ___ years, without pruning."
Or, for varieties claimed as compact, or "condo", etc., "Does this variety respond well to heavy annual pruning to keep it small, and still fruit well?"