Meet Flappy the squishy duck.  He feels velvety soft and squishy & is filled with soft foam like material.  
His super power is that he is great at 'flapping'. His neck, legs and wings all add to the flapping sensation when repetitively using him in this way.   So its a great squishy to stim with if you like to flap.  See video.  He can be gently stretched also.  He might not last a long time, especially if loved hard, but while he's with you, i promise you'll love him.