Flagella is found in bacteria, archaea, and eukaryota
cilia is found in paramecium
tentacles are found in octopuses and squid
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Flagella and Cilia are hair like appendages which help in locomotion in prokaryotic and eukaryotic cells.Basically the structures are same but if in a cell there is one or a few it is called flagella and if they are more in number it is called cilia.These structures move the fluid around them for movement.If the cells are immobile, then they are helpful in moving the fluid around them for transportation of food.
Tentacles are elongated flexible  organs present in some animals.They help in feeding and capturing of prey