Formal:
* Visual pun: This refers to a play on words using images.
* Picture rebus: This is a type of puzzle where pictures are used to represent words or phrases.
* Logogram: This refers to a symbol or picture that represents a word or phrase.
Informal:
* Picture word: This is a simple and straightforward term.
* Image puzzle: This emphasizes the puzzle aspect of the creation.
* Picture combination: This focuses on the process of combining the pictures.
Ultimately, the best term to use depends on the specific context and the intended audience.