Here’s a look at what’s available so far for Halloween. A few more items are typically added as we ease into September. Some of these items are available via Disney Store online: https://www.disneystore.com/disney-parks-product/halloween/mn/1001081+1000885/ while most are available via the Shop Disney Parks app. My favorite item from last year, the Figaro pumpkin plush returns, as do the Mickey and Minnie plush.
Yes those are Descendants costumes. No, I don’t know what Descendants is/are.