No, there are items which are labelled Toys, like the hobby horse. They can't be sold.
Judas Helviaryn wrote: »Don't incorporate bugs into your builds, and you won't have [an] issue.
(Assuming you're on PC)
There's an addon called Dustman that can automatically delete/sell a bunch of different items and contraband based on your preferences. You can set it to mark treasures and known recipes as junk, delete white stolen items, auto-sell all junk and ornate items when talking to vendors... it's made emptying a full inventory between dungeons painless and fencing runs require a lot less micromanagement.
kringled_1 wrote: »Just as a heads up, there's a fair number of similar junk items that typically go along with the jesters festival, so clearing your inventory tends to be a long term ongoing thing.