Warframe doesn't support cross-platform play on any system, nor can you move accounts between platforms

If you're planning on grabbing Warframe on the Switch and you're going in clean, then you have nothing to worry about. If you're a Warframe player on another platform, we've got some bad news for you. Warframe does not let you move an existing account to a new platform, and it's going to stay that way for Switch. On top of that, there is no cross-platform play between any versions, Switch included.