The show’s animal characters were to all be puppets made from the objects and fabrics that you might expect to find in the children’s dormitory. So the Crocodile was made as a skeleton of coat hangers for vertebrae with copper tube as “ribs”. The main body parts divided into front and back skates with a floating joint and puppeteers legs clad in fishing waders would act as the Crocodiles’s own.
The front puppeteer sat on a rocking chair and provided the directional steer whilst operating a 3 stage mechanism for Neck/Head/Mouth. Forward thrust came from the back puppeteer who was laying face down on a kind of gym horse and could wag the tail with a lever.