A shoggoth (occasionally shaggoth ) is a fictional monster in the Cthulhu Mythos. The being was mentioned in passing in sonnet XX ("Night-Gaunts") of H.P. Lovecraft's sonnet cycle Fungi from Yuggoth, written in 1929–30, and were expounded upon in his novella At the Mountains of Madness (1931).
The definitive description of shoggoths comes from the above-quoted story. In it, Lovecraft writes them as massive amoeba-like creatures looking like they are made out of tar, with multiple eyes "floating" on the surface. They are described as "protoplasmic", lacking any default body shape and instead being able to form limbs and organs at will. An average shoggoth measured fifteen feet across when a sphere, though the story mentions ones of much greater size.
Mythos media most commonly shows them, although intelligent to some degree, dealing with problems using their great size and strength. For instance, the original one mentioned in At the Mountains of Madness simply rolled over and crushed giant albino penguins that were in the way as it pursued the characters.
The character of the Mad Arab, Abdul Alhazred, found the mere idea of their existence on Earth terrifying.
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Official Site: H.P. Lovecraft
Links: Wikipedia At the Mountains of Madness Yog-Sothoth.com- Shoggoth