Will there be thorns in my wood chips?

There could be. In most cases the thorns will break down and dissolve after laying on the ground for a few months. In general, you shouldn't plan on walking around your yard bare foot after you've laid down mulch. Even without thorns wood chips will still give you splinters. If you're using the wood chips for a playground, specify this in your description and list 'no thorny species'. Hopefully the arborist will honor this request, but unfortunately we can't make any guarantees. It's a 'use at your own risk' sort of deal when it comes to thorns and spikey tree bits. Nature is a nasty thing. 🌵