Yes there are many tools to research hashtags and they are ways you can do this manually with Flicktech.com, it suggests some best hashtags for any keyword.

3 IMPORTANT TIPS FOR HASHTAGS

-Use hashtags that are trending

-Use 20-30 niche targeted hashtags per post

-rotate between different set of hashtags

YOU CAN ALSO USE THE STAIRCASE METHOD

-Use 7#s with the same avg engagement as you

-Use 7#s with 30% more engagement than your average

-Use 7#s with 30% less engagement than your avg engagement

You can also use a scheduling tool like ‘Later’, it provides a list of suggested hashtags based on the keyword you enter.

Hope this answers your question