You COULD run two DC brushed motors from one controller, but it would not be a good idea. You could run them in series and they would split the available voltage. Run them in parallel and they will split the available current. Or actually draw twice the current.
Brushed motor controllers are so ridiculously cheap it doesn't make sense to do this. You can get cheap controllers on fleabay and amazon for next to nothing. Just google PWM controller. Also a proper twin screw installation has a left hand and a right hand prop. This reduces crabbing. Also if the props turn inward, you can deliberately crab the boat sideways with no for or aft motion with the heading unchanging, which can be handy for docking. It also facilitates running on one motor. If they props turn outward, the boat can pivot exceptionally well and "steer" nicely with the props when backing. Your choice. But you don't want two right hand or two left hand wheels. So, no matter how you slice it or dice it, you need to be able to run the motors both ahead, both astern, and one ahead and the other astern. At individual varying speeds. Two $50 controllers better than one nice Altrex or whatever. Or get two high quality controllers. But don't use just one controller.
Somehow you got to figure out how to have a left hand and a right hand prop. And there is the problem. Since trolling motors are simply not designed to be primary propulsion equipment, no provision is made for counterrotation. IOW, you are unlikely to find a model wwith both a left hand and right hand variant.
Will having two right hand props work? Sure. Will it work as efficiently as it should? Nope. Will it work good enough for you? Maybe.
I am thinking Torqueedo might do both right and left hand props. At least they should, since they are meant to be used as primary propulsion. Certainly you can build electric outboards with either right or left hand props.
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