The tongues are along the top and right sides of the pieces shown ... Once the puzzle is the proper size, the image is added by importing and extruding an SVG. Another cool aspect of these puzzles ...

Create Jigsaw Puzzle Animation in Blender 2.9. Can be used to make a logo reveal video Timestamp 00:00​ Introduction 00:30 Create SVG file 00:47 Use SVG files 01:36 Create a jigsaw puzzle 03:59 Rigid ...