Frog Spawn Soap

Then they visited Zonko's, which was so packed with students Harry had to exercise great care not to tread on anyone and cause a panic.  There were jokes and tricks to fulfill even Fred's and George's wildest dreams; Harry gave Ron whispered orders and passed him some gold from under the Cloak.  They left Zonko's with their money bags considerably lighter than they had been on entering, but their pockets bulging with Dungbombs, Hiccup Sweets, Frog Spawn Soap, and a Nose-Biting Teacup apiece.

--PA14