The Slizzard is a creature from the movie Spy Kids 2: The Island of Lost Dreams. It is the only one without a pun on a real creature and is a hybrid of a snake and a lizard.
It has the head and neck of a green snake with the body of a large green lizard. It bears a close resemblance to a dinosaur like a T-Rex.
Spy Kids 2
A slizzard was the first creature to be exposed to Romero's growth chemical. While Carmen and Juni rode on a hovering magnet scooter, a group of small slizzards hitched a ride. The kids quickly abandoned it and jumped off. Another Slizzard was tamed by Gary Giggles, who rode it to combat Juni on the Spider-monkey. The Slizzard used its neck to make a pillar fall on the Spider-monkey. Carmen knocked Gary off of the creature's back. The Slizzard hissed at her, before the recovered Spider-monkey trapped it in its web, The slizzards were seen near the end, embracing Romero along with the rest of the creatures. Romero rode on it, which then swallowed the miniature Transmooker.