Banana-nana-fofanana

This spell transforms any item you touch into a banana. The banana can be eaten and it will heal you 1d4 points.

This spell does behave similarly to polymorph.  

At level 6 you can cast this spell on an entity. The affected entity has to make a Wisdom saving throw. The banana can be eaten for 2d8 health points, and the entity must make a Constitution saving throw.