Logic suggests that 'frog' on top would achieve nothing, except you would use more mortar.
'Frog' on base makes it easier when tamping the brick down(less resistance) and because some mortar is forced into the frog it helps to key the brick.
Well that's my theory!
With solid or perforated bricks, the orientation of the brick doesn't matter, but with frogged bricks, the frog should always be laid uppermost. This ensures that the loading of the wall is evenly spread across its width, rather than being concentrated onto the edges, and that there are no voids within the brickwork that could be weak spots.
When I built my porch (ambitious, I know ) I used the bricks with three holes down the middle, god it was so annoying to lay a line of mortar only to watch half of it disappear through the holes!
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