Just a couple of suggestions:
If your students are going to making items that'll come in contact with food (eg. honey dippers) I very,
very strongly suggest that you make sure you
know the wood ID and that it's food-safe. ie. a Fruitwood or a neutral timber such as Oak.
All too many free timbers have an "I think" attached to their identity... which isn't ideal.
But apart from that, if you're not averse to garden prunings, then I've found green timbers to be good for absolute novices... esp. when first learning tool handling and they're not going to produce anything worth keeping. (It's so much easier for them to produce long curlies and get the "Oh Wow! This is fun!" factor. Better quality timbers are best saved for later lessons, after they've been hooked.

)