I love the picture! It's very cute and a great idea for using the faces.
Are all the faces as toddler-like as the one shown? If so there are some really good books on the subject of crocheted toys, which I'm sure you're familiar with. I think it might be interesting to put a doll's face on an animal shaped toy.
If that idea doesn't appeal, I don't see why you couldn't do the same thing you have done in the picture only use a different style hat and a more toddler or young child body for the doll.
There is a wonderful book called
Cloth Dolls by Brenda Brightmore that has patterns for dolls of all different ages.
You can read my review of the book here:
Review of Cloth Dolls by Brenda Brightmore The article also has a link at the bottom to buy the book if you wish. I highly recommend the book because it is full of information on cloth doll construction and has great patterns as well.
I hope this helps. Please keep us updated here at the doll making forum as to what you do with the other faces.