You can loggin in Inaturalist. In that website you can search this and other organisms and wildlife.

https://www.inaturalist.org/

Surely it is Azolla

Yes..Azolla indeed..

It is Azolla

Thanks for answer. Is it possible to identify species too.

Dear Katrina,

Appreciation for your help.

I am not very sure about the species but may be Azolla microphylla.

Thank you so much Katrina,

You make my task easier. Convey my warm thanks and regards to your friend.

Thank you everyone for taking time to answer the question.

Really looks like Azolla pinnata.

To identify Azolla's specie you must prepare some microscopic slides of sporocarpi (microsporoparpi and macrosporcarpi) and observe glochidia an macrosporae.