Kweebecs are NPCs that resemble small trees. As seen in the Get to know Hytale's NPC Blog, they have their own culture in which they learn, play with and teach other Kweebecs. They have multiple stages of their life cycle starting as small leaf-like creatures, and ending up bursting energy and becoming a tree.
There is no information about what items this mob drops.
This mob can be found in the Emerald Grove.
There is no information regarding Kweebec behavior.