Among the animals you've listed, the slow loris is the only venomous one. The slow loris has a gland in its elbow that produces a toxin, which it can apply to its fur or deliver through bites, making it harmful to predators or threats.
The other animals listed—corn snake, Philippines sailfin lizard, and Pacific tree frog—are not considered venomous. The corn snake is a non-venomous constrictor, the Philippines sailfin lizard is not venomous, and while the Pacific tree frog can produce some toxins through its skin, it does not deliver venom in the way that a venomous animal would.
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