No because the game’s stopped after the ball goes into touch and the referee blows his whistle. After a tackle the game is still live, but the ball isn’t back in play until the PTB.
From the laws of the game:
Losing possession 8. A tackled player shall not intentionally part with the ball other than by bringing it back into play in the prescribed manner. If, after being tackled, they accidentally lose possession, a scrum shall be formed