Line a large baking tray with parchment paper and set aside. You may need multiple trays depending on how many spiders you're making.
Cut each Pocky stick in half, removing the exposed pretzel end first for cleaner cuts. You'll need 8 leg pieces per spider (4 on each side). This step can be done ahead of time and is perfect for getting kids involved in the prep work.
Carefully twist apart each Oreo cookie, keeping both halves intact. Try to keep most of the cream filling on one side - this will be your base.
In a microwave-safe bowl, melt the chocolate wafers using 30-second intervals on low power, stirring between each interval. The mixture should be completely smooth and easily spreadable when ready.
Take your Oreo base (the half with more cream) and gently press 4 Pocky leg pieces into each side, angling them slightly downward for a realistic spider stance.
Spoon a small amount of melted chocolate onto the center of each spider base.
Gently place the second Oreo half on top, pressing lightly to secure. Take care not to press too hard and break the cookies.
Spread a thin, even layer of melted chocolate over the top cookie using the back of a spoon. Work quickly as the chocolate will begin to set.
While the chocolate is still wet, place 2-3 candy eyeballs on the lower center portion of each spider. Press gently to ensure they stick.
Allow spiders to set completely at room temperature for 15-30 minutes, or refrigerate for quicker setting. The chocolate should be firm to the touch before serving or storing.