I use the Etsy Mini, is that what you are looking for? It puts an Etsy gallery on your site that will click into your listings.
Go to Your Shop>Listings and look in the left column. Under Promote, you should have a link for Etsy Mini.
There you can make a mini gallery for your site at variable sizes depending on how much width you have. Grab the HTML code by highlighting the code and pressing Crl C. That will copy the code to your clipboard.
Then go to your wordpress site and select the HTML view. Use Crl V to paste the code wherever you would like it to go.
You may not be able to see the mini until you preview or publish the post, so don't freak if it's not there in compose mode.