Icons on the dock and in the application overview correspond with desktop launcher files. These are small text files with the
.desktop extension. They provide information to the operating system on how to launch the application, what icon to use...
If an application has no corresponding
.desktop file, or some of the elements in the
.desktop file are not properly defined, the system may revert to a generic icon and a generic application name.
You can locate all
.desktop files containing for example
KColorChooser with the command
find / -name '*.desktop' -exec grep -H $1 "KColorChooser" \; 2>/dev/null
Specifics for KDE snap applications
I can not fully reproduce the issue you indicate: for two of the three applications you mention, I get two icons, one with correct icon and one with generic icon. When launching, the correct icon is used in the dock, and the correct application name is shown.
For some KDE packages that come as a SNAP, there may be packaging issues. When installed for the first time, two different
.desktop files are installed under
They have different names and a different
Exec= line, hence they appear as two different icons.
kcolorchooser_kcolorchooser.desktop specifies the full path of an icon under
/snap/kcolorchooser/, and is the one showing the icon.
kcolorchooser, but that apparently is not within the normal search path for icons, and a generic icon is shown.
A workaround is to hide the "bad"
.desktop file. Copy it to your
~/.local/share/applications directory and add a line