This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Keythong (Heraldic)
In British heraldry, a male griffin is shown without wings, its body covered in tufts of formidable spikes, with a short tusk emerging from the forehead, as for a unicorn. In some blazons, this variant is termed a keythong. This distinction is not found outside of British heraldry; even within it, male griffins are much rarer than winged ones, which are not given a specific name.
One example is John Butler, 6th Earl of Ormond, whose badge was described as featuring a pair of keythongs". It is possible that the male griffin/keythong originated as a derivation of the heraldic panther. The keythong originated in the 15th century, sometimes called an alce. When it first appeared, there was no distinction made between the keythong and the proper gryphon, so they share many attributes from medieval lore.