Yeah, that's Glo Worm. My sister had one. Because it used large batteries and had a plastic head, Glo Worm was a deadly melee weapon in sibling fights.
They did make those heads out of pretty wrong plastic. I remember a girl took a cabbage patch kid and actually concussed me with it. My vision went black. It left a big cartoony bump.
Uhh... Glo Worms are infant toys. Like, for 6-9 month old babies. My daughter had one when she was a baby and she loved it. Saying the toy "sucked" is like saying, "Yeah, man, Fischer_Price stacking rings suck. It only takes like 4 or 5 tries to figure it out, and after that it's just boring plastic rings on a stick." Even in elementary school, you're not the target market.