Why do they call it pig latin?

Answer 1

Pig Latin is a language game primarily used in English. An alternative British name for Pig Latin is backslang (in Britain this term more often applies to the type of backslang used by the criminals of 19th century London and used as a playground game today, which was based on turning words backwards), or Butcher's Backslang which was common in English Butchers' shops at least until World War II. Prior to this, Benjamin Franklin was known to use a version of Pig Latin in some publications. Pig Latin is usually used by children for amusement or to converse in (perceived) privacy from adults or other children. Conversely, adults sometimes use it to discuss sensitive topics they do not want very young children to overhear. A few Pig Latin words — ixnay (nix) and amscray (scram) — have been incorporated into English slang.

Answer 2

there is no realy reason for its name