Is there a possible way of converting strings?

I'm not exactly sure what you're trying to do here, as neither the title or the description is that informative, so I'm assuming that "form" is a string and you are trying to use it as a function.

commonly i like to use tables for this purpose, specifically dictionaries.

As dictionaries have string keys, it is actually pretty straightforward. You can simply index the dictionary with the string and input parameters like such:

local tbls = {
    foo = function (q,w,e)
        print(q,w,e)
    end
}

Event.Event:Connect(function(command,ree,ko,ef)--"foo","jack","jill","dead meme"
    print(command)--foo
    tbls[command](ree,ko,ef)
end)