Some of our fonts do, some don't. If you go to our dafont profile with accents turned on & preview set to show the umlauts you can get a list of the fonts from the pack that support them: https://www.dafont.com/chequered-ink.d6231?text=%E4%F6%FC%DF&a=on
This link will show all the fonts that support those characters to varying degrees.