AlphaOops! H Is for Halloween by Alethea Kontis
This book is super cute. The letters of the alphabet are putting on a Halloween show and they get all out of order in the process. The letter “B” keeps picking costumes that other letters have picked synonyms for until he finally finds the perfect word starting with B. At the end all the letters have a big Halloween party. The pictures are cozy little kid Halloween style instead of creepy, and the text is both short and interesting enough that you can read it to toddlers over and over and both of you will enjoy it.