This is the 3346th most frequent Dutch word.
katje
"Katje" means "kitten" or "catkin" in English.
Here, 'katje' refers to a young cat, known as kitten in English.
Het katje speelt in de tuin.
The kitten is playing in the garden.
In this sentence, 'katje' is used metaphorically to refer to a small plant or sapling.
Ik heb een katje van passiebloem geplant.
I planted a sapling of passionflower.
Here, 'katje' is an affectionate term, possibly referring metaphorically to the voice or art of the singer.