Mr. Gronkle is an elderly grouchy warthog who is never fond of children. He is rarely compassionate and has things to get his way. He appears in the episode Grouchy Mr. Gronkle from The Busy World of Richard Scarry. However, he makes a cameo in The Best Birthday Present Ever.

It is revealed in the Busytown Mysteries episode "The Mystery of the Unpopular Pizzeria" that Mr. Gronkle's first name is Gordon.

He may be a grumpy boar, but has a heart of gold.