Wiktionary
horseling
n. A young or little horse; foal; pony.
Usage examples of "horseling".
When she got there, she found Gwylly currying the pony while the horseling munched oats from the stall feedbox.
Warrows sprang forward and darted and dodged down among milling horses and horselings and fighting men and Dwarves and Elves, and they caught up ponies and leapt astride.