Chitter in Green Cave B1F drops Sharp Talons (the squirrel looking thing)
Orc Archer in Whale Island B2F drops Thin Sticks
For any of your loot finding needs, you can also check out the Bestiary thread, and use ctrl + F to search for specific items. I made sure that all the item names were put in as they appear in game, so the search function should work great there.
Ah! Search tip for anyone using ctrl + F in the Beastiary thread: I put the names in their singular form. No "s" at the end of any of them. Also, I sent the doc I had that is also complete with drop rates to MKBound, and it is going to be converted to a FAQ.