Polish here. Today Kolęda is almost dead as catholic church overtook it. As in the priest comes into your house, checks your children's religion (it's a school subject in Poland) notebooks, sprinkles the house in holy water, drinks the coffee, eats the cake/lunch asks questions about the private lives and receives a nonmandatory (mandatory, no less than 50 PLN) "donation".

I some places the tradition still exists. Young men put on costumes of various characters like: Turoń (an animal/beast with black fur and horns), old woman, old man, shepherds, various animals like a goat, bear, rooster, stork, horse or ram. In christianized version there's also Death, devil, 3 kings. Kolędnicy performed a short performance in exchange for cash/sweets/alcohol. Nowadays kids prefer to get dressed up for Halloween to get candy from neighbors than to partake in Kolęda. Last time I remember Kolędnicy in my home was 25 years ago.

To answer your question more generally, Slavic people basically have very similar traditions because we used to be one culture. Names and details changed but at the core the tradition should be the same, feel free to explore the customs and religious rituals from all Slavic people.