Le mot anglais pour poulain est
foal

Définition en anglais

poulain
1. n-m. foal (young horse)
La poulinière a mis bas un beau poulain. - The mare gave birth to a pretty foal.
2. n-m. protégé; mentee
Il affirma que Kadyrov est un poulain de Poutine. - He stated that Kadyrov is Putin's protégé.

Colt
1. n. A revolver (gun) (from Colt's Manufacturing Company), associated especially but not exclusively with the American Wild West.
2. n. A young male horse.
3. n. A youthful or inexperienced person; a novice.
4. n. (nautical) A short piece of rope once used by petty officers as an instrument of punishment.
5. n. (biblical) A young camel or donkey.
6. v. (obsolete, transitive) To horse; to get with young.
7. v. (obsolete, transitive) To befool.
8. v. To frisk or frolic like a colt; to act licentiously or wantonly.

foal	©
1. n. A young horse or related animal, especially just after birth or less than a year old.
2. n. (mining, historical) A young boy who assisted the headsman by pushing or pulling the tub.
3. v. To give birth to (a foal); to bear offspring.