The LaTeX command for amalg (⨿) is \amalg.
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Write \amalg inside math mode, that is between $…$ for inline math or in a \[ … \] or equation block for display math. It is part of core LaTeX math, so no extra package is required.
As a binary operator, \amalg gets a medium space on each side; at the start of a formula LaTeX reads it as a sign and drops the space. With unicode-math under XeLaTeX or LuaLaTeX, typing ⨿ in a formula gives the same symbol.
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Binary operators in LaTeX: the full table or search all 350+ LaTeX symbols.
Use \amalg in math mode; it needs no extra package. For example, $a \amalg b$.
None: \amalg is built into LaTeX, so no extra package is required.