Yes!
To do that, choose the desired poll in the "Polls" list and select "Edit" in the pop-out menu as shown below.
When editing a poll you can change a variety of settings, including:
- Question
- Options
- Options images (web)
- Poling template (web)
- Add or remove options
And many more.
Note: you can edit open ended or word cloud types of questions with the same workflow as described above.