My 23 month old granddaughter is a huge fan of the Five Little Monkeys Book, so the Five Little Monkeys Puppets are great to play with while reading the book.  Note - they aren't actually finger puppets, but regardless they're lots of fun.  Their hands have Velcro so they can 'hold' hands and be strung together in a group of 5.  Then when one falls off the bed, the remaining four hold hands.  Lots of fun for little ones!!