This is like a game of Hungry Hippos with sweets.
Plate, Sweets, Straws, Cups
Fill a large plate with sweets such as M&Ms or Skittles and give each Beaver and Cub a paper cup and thin straw. At the signal, they each have to use their straw and suction to pick up as many sweets as they can and drop them into the cup. The one with the most sweets in their cup at the end wins.