"Ducky" can refer to a number of things. Check the current list of ducky* tags to see if there is a more specific one that fits what you are trying to tag.

Some of the more popular tags from the list include...

Artists

• ducky_(artist)
• duckyeah
• duckydeathly
• ducky0ng_0_0
• duckymomoisme
• duckymonstah

Characters

• ducky_(the_land_before_time)
• ducky_(aducksomewhere)
• ducky's_mom
• duckyawesome_(character)

Other

• ducky_daycare
• duck (for the animal itself)

...but check the complete list if the one you want isn't listed here.