Minecraft wiki entry for Hoglin, associated text: 2–4 raw porkchop (cooked porkchop while on fire). The maximum amount is increased by 1 per level of Looting, for a maximum of 7 with Looting III.
0–1 leather. The maximum amount is increased by 1 per level of Looting, for a maximum of 4 with Looting III.
5 if killed by a player or tamed wolf.‌[Java Edition only]
Baby hoglins drop only experience.
In fact, baby hoglins are the only mobs that both grow up and drop experience when killed.
In Bedrock Edition, both adult and baby hoglins drop 1–3, if killed by a player or tamed wolf.