With the increasing popularity of Artificial Intelligence in educational research, chatbots seem to be a promising future technology that could help students with their daily problems. As part of Smart Learning Environments, they can be permanently accessible by natural language via a variety of interfaces. To investigate the property of "tangibility", we present TABBI, an interface for educational chatbots that allows students to interact with a physical robot. This robot interface will be used in future comparative studies to evaluate interaction possibilities with educational chatbots. In this paper, we describe the general idea and context of TABBI.