Oh, we have a lot of those. Here’s a few from the top of my head:

Omata lehmän hermot / To have the nerves of a cow (a really calm person).

Lauhkea kuin lammas / As gentle as a sheep.

Viedä kuin pässiä narussa / Being lead around like a ram on a leash. (Stubborn as rams can be, they can be easily made to follow you if you don’t walk in a straight line. You have to make small curves on your way to distract the ram. A metaphor of apparent deception.)

Viekas kuin kettu / Cunning as a fox.

Olla kuin perseeseen ammuttu karhu / To be like bear who’s shot in the ass. (A truly pissed off person.)

Lämpö menee harakoille / The warmth goes to the magpies. (When a window or a door is kept open too long during cold weather.)