In bedrock edition currently, there isn't a tool used to break mangrove roots. its pretty tedious to break them slowly, unlike java edition. In java edition mangrove roots can be mined with an axe.
See the videos below for gameplay examples.
MCPE-157751
No assigned tool to break mangrove roots with.
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We're tracking this issue in MCPE-155606, so this ticket is being resolved and linked as a duplicate.
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