Upper right - Quartet by Peter Arrhenius and illustrated by Ingela Peterson published in 1998. Great New York City connections, jazz, and penguins!
Lower left - Little Penguin's Tale by Audrey Wood published in 1989. From back cover, "While Granny Nanny Penguin is telling a wonderful story of long ago, Little Penguin wanders off on an adventure of his own!"
Lower right - Cuddly Dudley by Jez Alborough published in 1993. From back cover, "Dudley the penguin is so cuddly that everyone wants to hug him. But he hates being hugged! What will he do?"