Not to be a stickler, but a dove tail is a sliding joint- the dovetail itself is a trapezoidal section with the narrow side facing the part it’s on.

The slot is similarly cut so it slides into place.

This is (basically) a fat biscuit join, which is good. Peg designs might be better - prefer pyramidal pegs, they self center and have more surface area for glue, and they print neater when they have suboptimal orientation to the print bed.