A figure of speech such as he is strong an ox called a?

The figure of speech "He is strong as an ox" is called a simile.

Here's why:

* Simile: A simile is a figure of speech that compares two unlike things using the words "like" or "as". In this case, the person's strength is being compared to the strength of an ox.

Let me know if you'd like to know more about similes or other figures of speech!