Although the Warp 2D tool warps a single image, you can morph between two images using the following workflow:

To warp between two images:

1. Add a Warp 2D tool node to image A.
2. Place all your source shapes onto image A.
3. Change the viewer to be viewing image B using a context point, and align all the destination shapes on the corresponding features of image B.
4. Animate the Warp from 0 to 1 interpolation, which warps image A toward B.
5. Copy the Warp tool, select the Invert-Warp button and connect Image B as its input.This will warp Image B backwards towards A.
6. Add a Blend tool node between the two warp outputs and animate it from 0 to 1.