Tefe greens have far more green to red, and do not have a light blue to them when young. They also will have more yellow/orange in the center of their body, as seen in the top discus. This does not look like a pure tefe, but the top is more like a juvy tefe green then royal blue. The lower one is not a tefe, it looks like a royal blue scribbled, but is definitely not a tefe green IMO. Yes they are definitely stunted already, they need more food. Even people with lives need to find time to feed the discus enough. Their health should not revolve around when you have time. You decided to get these fish, you should have decided ahead of time how to keep them fed. An auto feeder that drop tetramin color flakes 2-3 times a day will help while you are gone during the day, but while they are young like this, it is critical to do water changes frequently, at least 3 times a week, and feed at least 4 times a day. Do you feed blackworms and beefheart?