The Mini P.E.K.K.A says "Pancakes" when it attacks. This phrase is also shouted when it is deployed in battle. The sound is a notable and iconic part of the character's personality in Clash Royale, adding charm and whimsy to the game. Some players also interpret other murmurs or words during attacks, but the most recognized phrase is definitely "Pancakes".

In summary:

• Mini P.E.K.K.A shouts "Pancakes" while attacking and when deployed.
• This phrase is part of an Easter egg by the game's developers.
• Some community discussions mention hearing other variations or interpretations, but "Pancakes" is the official and primary attack phrase.

This clarifies what Mini P.E.K.K.A says during its attacks in Clash Royale.