Froghemoth

Froghemoths are creatures not of this world. A journal purportedly written long ago by the wizard Lum the Mad describes strange, cylindrical chambers of metal buried in the ground from which froghemoths emerged, but no reliable reports of the location of such places exist.

Every few years, a froghemoth can lay a fertile egg without mating. The froghemoth cares nothing for its egg, and it might eat the hatchling. A young froghemoth's survival is most often predicated on its parent leaving it behind in indifference. A newborn froghemoth grows to full size over a period of months by indiscriminately preying on other creatures in its swampy domain. It learns to hide its enormous body in murky pools, keeping only its eyestalk above water to watch for passing creatures. When food comes within reach, the froghemoth erupts from its pool, tentacles and tongue flailing. It can grab several targets at once, keeping them at bay while it wraps its tongue around another one and pulls it in to be devoured.

If a bullywug tribe comes across a froghemoth, the bullywugs treat the froghemoth as a god and do all they can to coax the monster into their den. A froghemoth can be tamed (after a fashion) by offering it food, and bullywugs can communicate with it on a basic level, so the creature might eat only a few bullywugs before following the rest. Bullywugs gather food as tribute for it, provide it with a comfortable lair, fanatically protect it from harm, and try to ensure that any young froghemoth reaches maturity.]