Please help...preschooler

Does anyone have any good book suggestions for preschoolers regarding friends, being a good friend, dealing with those that are not good friends, and dealing with frustration...how to deal with emotions and express yourself appropriately or even identify emotions and express it verbally. thanks

Thomas the Tank Engine or The Berenstain Bears

If this might help, Feet Are Not For Kicking, Teeth Are Not For Biting, and Words Are Not For Hurting are all good; also When I'm Feeling Angry; and the Mercer Mayer critter books like I Was So Mad.

No Fighting, No Biting is a classic. I remember it from when I was a kid.

Not about friendships, but when my 4 YO son was getting angry and frustrated he enjoyed reading When Sophie Gets Angry--really, really angry by Molly Bang.

Arnold Lobel's Frog and Toad books, maybe?

How to be a Friend by Laurene Krasny Brown & Marc Brown
Making Friends byFred Rogers
Friends! by Elaine Scott
Knuffle Bunny Too: A Case of Mistaken Identity by Mo Willems

For older preschoolers, Purplicious. It's a good one about being true to yourself even when others tease you. The No Bullies Allowed series by Teddy Slater is also good at illustrating different situations kids confront at school. They are mostly open-ended at the end, leaving you with a chance to discuss the issues with the kids.