Emojipo

It is the equivalent of a typo (typographical error) but for emojis, hence the word, emojipo.

"I'm sorry, I swear I wasn't mad. I just clicked the wrong emoji. It just an emojipo."

Neography

Neo + Graph

A constructed script created as a substitute for a writing system of an existing language or for a conlang.

"Tengwar is one of the well-known neography created by J.R.R. Tolkien."