Answer:
Dallas called it the "blue tongue team" from the science class experimentation where Georges had volunteered to help Mr. Landau, the science teacher, explain about the taste buds.
Step-by-step explanation:
Rebecca Stead's "Liar and Spy" is a children's story about a young boy named Georges and his family's move into a new apartment, his new environment at school and his new friendship with his neighborhood children. The story also delves into his interest in the "spying" world of Safer, his neighbor.
When Ms. Warner selected Georges to be the captain of the blue team, Dallas, the school bully called out "blue tongue team". This is from the incident in Mr. Landau's class where he had volunteered to be tasted for how many taste buds a person has. Mr. Landau had put a "white paper reinforcement . . . [then] dips a Q-tip into some blue water" after which he used his "digital camera, takes a close-up, and projects the picture onto the whiteboard". This is a way to explain to the class about the taste buds through the practical presentation of the "blue tongue-flesh protruding through the hole in the reinforcement that is still in my mouth, magnified ten thousand times." And from this point forward, Dallas started the "blue tongue team" title.