Farzad Varahramyan designed some creatures for a Tremors TV series before Tremors 2 came out, but Tremors 2 released in 1996 and Slogs were designed by Steven Olds in 1994/5.
To conclude: coincidence. Slogs are hardly a once-in-a-lifetime design. They're just exaggerated carnivores with no forelimbs.
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