To the person who found my site looking for “words that start with x in czech,” here you go, courtesy Josef Fronek’s 1999 English-Czech Czech-English Dictionary:
- xantipa
 - battleaxe, shrew
 - xenofob
 - xenophobe
 - xenofobie
 - xenophobia
 - xenofobni
 - xenophobic
 - xerografie
 - xerography
 - xerox
 - xerox
 - xeroxovat
 - to xerox
 - xeroxovy
 - xerox (adj.)
 - xylofon
 - xylophone
 
So presumably Czech children’s ABC books are stuck with xylophone just like we are. That is to say, if they include X at all. My kapesni slovnik doesn’t even include any X words, nor does Frantisek Kabele and Ludek Vimr’s Brousek pro tvuj jazicek, a children’s book of ABC rhymes (unfortunately one the few Czech children’s books I own).
Oh, and to the person who found my site searching for “mean little dogs,” sorry I couldn’t be of service.