Tip of tongue drains into -
Tip of the tongue drains into submental nodes, anterior 2/3 drains into submandibular nodes, and posterior 1/3 into jugulodigastric nodes.
Finally, all lymphatics drain into juguloomohyoid nodes, also known as lymph nodes of the tongue.
Occipital lymph node
Submental lymph node
Deep cervical lymph nodes
Tonsillar lymph nodes