No, hippos are part of family Hippopotamidae, which includes hippos and pygmy hippos. Pigs belong to family Suidae, along with warthogs and babirusas. Both families, however, are part of Order Artiodactyla.
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Hedgehogs are related to the shrew family they are something called an insectavora. Erinaceinae is there subfamily. The are NOT rodants. I have a hedgehog soo I studied alot on them. :) Hope I helped!:)