Q.sweet potatoes & corn
Would corn be a good companion in a sweet potatoe bed?
When I've grown sweet potatoes, I found that the underground growth (the roots and the potatoes themselves) as well as the above-ground vines can get pretty extensive. Sweet potatoes would choke out the corn (even though corn has a pretty shallow root system), so I personally wouldn't plant them in between each other. You could certainly plant them next to each other with about 3-4 feet of growing space around the potatoes with no issues. You'll also want some space between the sweet potatoes so that you can harvest them easily.
These articles will give you some additional information:
https://www.gardeningknowhow.com/edible/vegetables/sweet-potato/sweet-potato-companions.htm
https://www.gardeningknowhow.com/edible/vegetables/sweet-potato/grow-sweet-potatoes.htm
https://www.gardeningknowhow.com/edible/vegetables/sweet-potato/sweet-potato-container-crops.htm
