Is there a pattern name for allowing users to add fields?

Example one.

Example two.

When a user is allowed to add/remove additional fields (or field groups) within a form, what is this interface paradigm called?

EDIT: in the example screenshots, each “row” of field(s) can be added/removed by the user, building up a list of “things”.

There’s a separate question about this type of input paradigm (Allowing the user to add input fields). It’s asking about design/workflow, but not the name of the pattern. However, all/most of the screen examples on that question are relevant examples for my question