A passage within a composition of sonata form which resembles a coda, but occurs at the end of the exposition rather than at the end of the composition.In a fugue, a codetta is the linking passage between the entries of the subject or theme. a small coda, but usually applied to a passage appended to a section of a movement, not to a whole movement.

https://musicterms.artopium.com/c/Codetta.htm