I agree EJ, they do look a bit like dandilions in the beginning. Don't let Stephan get your goat by making you think you sowed dandilions hahahaha (or frisee, whatever that is, lettuce?).
I don't feed them but if it get very dry, I will give them some water on occasion.
Like Stephan said, don't lift before november, you need roots as thick as possible and that takes time.
Mine are coming along nicely too, maybe 15 cm tall.