There's just something about the Snowmandos in Fortnite — they always look like they're out to get you.
Anyway, the latest Operation Snowdown challenge tasks you with hiding inside them, across three separate matches.
Here's a good place to find them:
An easy way to complete this mission, like most, is to do it in Team Rumble mode. This way, there's no time or circle pressure to contend with — just pesky other players getting in your way. Respawns help, though.