Where to catch Swinub

In Kitakami (Scarlet & Violet – The Teal Mask)

• Chilling Waterhead — Walk
• Kitakami Hall — Walk
• Mossfell Confluence — Walk
• Oni Mountain — Walk
• Oni's Maw — Walk
• Reveler's Road — Walk

In Johto & Kanto (Gold, Silver & Crystal)

• Ice Path — Walk

Swinub — full Pokédex entry