[3] In this case the cups featured one or more painted or three-dimensional ceramic frogs or toads that slowly emerged at the bottom of the vessel as it was drained.
An unsuspecting drinker would be surprised as he quaffed his beer to see a frog or toad emerging from the typically cloudy beverage of those days as it was fully consumed and the amphibian came into view, with predictable results.
In some cases the creature would gurgle and spit at the drinker through a hole in its mouth as the vessel was tilted and the dregs consumed.
[7] Transfer-printed designs are often found on these mugs with patriotic sentiments, mottoes, proverbs, sayings, educational verses, pictorial images, etc.
[16] Some of these mugs were made with the intention of encouraging young children to finish their drink by exposing the frog or toad.