I use to be a grill cook, and I made mickey pancakes for any kid that ordered a pancake. (I made them for some adults too!)
I had a pancake gun at work, but you could use a measuring cup, or ladle or anything.
Other people already suggested with the two small circles and one large. My recommendation is to make the two small circles (ears) first, spacing them just right, then add the larger head. When I did it opposite, I always ended up with one ear bigger than the other, or one ear that didn't "grow" quite enough, and never connected.
I'm sure it would work either way though, I just always had to make everything VERY fast to please the customers, and this was the quickest most successful way I found.
I then always added chopped sausage for the eyes and a bacon smile. You can even cook bacon in a smile shape.
Now, I'm thinking we need to have mickey cakes for breakfast in the morning!