You sure can.
From the "My Forms" tab with the form selected there is a "Duplicate" button on the toolbar along the top, there is also "Duplicate" in the right click context menu on a form:
Also, you can export a "Design file" (basically a template) of any form locally that can be implorted into your or anyone elses account. With the form open click "File" - "Export design File". This will save a design file to your computer which you can use to "Import Design file".