No, you can only connect one channel to one Intercom workspace.
Yet to one Intercom workspace you can connect as many channels as you want.
What is one channel:
One WhatsApp or SMS number,
One Telegram or Viber Bot,
One Facebook, VK, OK.ru page,
One Twitter, LINE, WeChat or Zalo account.
What is one Intercom workspace:
Any Intercom workspace, including Intercom Test one.