Fluency River is a tool for professionals in the field of Speech-Language Pathology that can be used to help children with stuttering issues. From the publisher's website:

Fluency River™ is a fluency game that uses a river and its components to help students ages 5–9 learn about stuttering and become more fluent speakers. The goal of the game is for students to become comfortable with their speech and gain confidence by using fluency strategies to continually improve their speech. Up to eight players may play at a time. Fluency River™ will make an exciting and challenging supplement to your fluency therapy programs, kits, and guides.