The main collective noun for Sloths is a “pile”. Other collective nouns for Sloths include a “snuggle”, a “bed”, and a “slumber”. Since Sloths are solitary animals, there are no commonly used collective terms for them.
The etymology of the collective noun “pile” in relation to Sloths is thought to come from the fact that Sloths often sleep in a pile, huddled together for warmth. This behavior is seen in many species of Sloths, and is thought to be a way for them to conserve energy.