Using Photogrammetry (https://www.3dflow.net/3df-zephyr-free/) i did Copys of some Gardenfrogs. Here's the second.
The Original has an Height of 15cm but feel free to scale ;)

To get an smoother Bottom just put it in your Slicer 1mm Z down into Printbed.

For more Info View: https://www.thingiverse.com/thing:3683029