Possible Clues:

• Class including salamanders and toads
• Class of cold-blooded vertebrates
• Newts etc
• Share a tent starting off near Knock briefly overlooking bank with class of swimmers
• Class that includes newts and frogs
• Frogs and toads
• Salamanders etc
• Class of frogs, toads, etc
• My confession of being worse liar? It shows class, naturally
• It's used in cheesemaking