Hello, I don't know the name of the bike that is double seat and double bars. But you can search it on Google search where you will find your answer easily. I always prefer to use Google search whenever I want to search something. Recently, I want to know the difference between Shimano Tiagra and Shimano 105 bicycle equipment and I found
https://www.bikethesites.com/shimano-tiagra-vs-105/ website with the help of a google search. That is why I am also recommending you to search it over there.