It’s the “Where is Thumpkin” song. It’s to the tune of Frère Jacques, and you go through each finger holding them up and calling out “Where is <finger name>? (x2) Here I am. (Reveal x2) How are you today, sir? Very well, I thank you. Run away. (x2)”. The finger names, in order, are Thumpkin, Pointer, Tall Man, Ring Man, and Pinky