Nah miracle grow is no good for growing cannabis. They definitely look hungry for nitrogen but be careful not to burn them if they aren't very big. I used to use Mexican guano but I've had some nute burn issues so I use fish emulsion instead plants seem to love it and they absorb it very fast also very difficult to burn plants with. Only downside is it smells really bad I recommend wearing gloves when handling it.
Miracle grow is full of fertilizers that are not good for weed, and holds moisture too long, perhaps leading to root rot. Better (adult plants anyway) to use better soil for growing weed