A "silly worm" most likely refers to a Squirmle (also known as Snoots, Magic Twisty Worms, Wiggle Worms, or Worm on a String), which is a toy designed to look like a live worm and used for entertainment or magic tricks.
These toys consist of:
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Appearance: They have a furry body, eyes, and resemble small worms in appearance.
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Mechanism: A hidden string allows the user to make the "worm" appear to move and perform tricks.
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Purpose: They are used as toys, novelties, and sometimes incorporated into simple magic tricks.
In essence, a silly worm is a toy worm that can be manipulated to appear alive and engaging.