Yes, you can do this 3 different ways:
By using custom css to override the default view and add your own font icon or background image
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By using the following 2 built-in filters (you’d need to add these to your theme’s functions.php file or through a custom code plugin):
apply_filters( 'mtphr_dnt_direction_nav_prev', '<i class="mtphr-dnt-icon-arrow-left"></i>' )
apply_filters( 'mtphr_dnt_direction_nav_next', '<i class="mtphr-dnt-icon-arrow-right"></i>' )
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Or you can override the directional navigation template. Add this directory to the root of your theme: “dittyticker” and then copy the “plugins/ditty-news-ticker/templates/directional_nav.php” file into that directory. Then modify your copied file as needed.