Tinker is a character from the Swazzle puppet show B.A.R.K. the Robot Dog. He is friends with Ratchet, and helps him by zooming around the house in his hamster ball to collect yarn for Ratchet's yarn ball. At the end of the show, he helps save the day by knocking out Bad B.A.R.K..

Tinker was designed, and built by Patrick Johnson. Tim Sweeney has performed the character throughout the show.