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The foreground value (red, in this case) does change the color of the text in the TextBlock. But it does not change the color of the Description text. There seems to be no way to change the Description text color.
<syncfusion:RibbonButton.ToolTip>
<syncfusion:ScreenTip
Foreground="Red"
Description="My Description">
<TextBlock
Width="130"
HorizontalAlignment="Left"
Text="This is my tooltip Text"
TextWrapping="Wrap" />
</syncfusion:ScreenTip>
</syncfusion:RibbonButton.ToolTip>