Another way to do the activity is if there are enough kids, give each one an egg and see who else has the egg that makes the same sound. That might be a good circle time activity.
Finally, a third way to do this activity is to make a key like I did below. I taped each object to the piece of paper. You can start with the six eggs that correspond to the object. See if the child can match the object with the sound. You can add the other six eggs to make it a little harder or do 12 objects instead of six. You can do any number of eggs you want. I chose twelve because I had an egg carton to put them in.