Use a number generator

Prefix
1. Raven
2. Pigeon
3. Viper
4. Moth
5. Leopard
6. Weasel
7. Cricket
8. Adder
9. Minnow
10. Trout

Suffix
1. Tail
2. Fang
3. Ripple
4. Branch
5. Scale
6. Moon
7. Leaf
8. Spot
9. Streak
10. Flicker