Sides aren't acute, angles are. A triangle with three acute angles would be called (appropriately enough) an acute triangle.
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They both have 3 sides but an isosceles triangle has two equal sides whereas an acute triangle with different acute angles has no equal sides and is said to be a scalene triangle, or an acute triangle with three equal acute angles (of 60° each) and three equal sides is called an equilateral triangle.
An acute triangle may have three, two, or no congruent sides.
An equilateral triangle.
Any triangle that has three equals sides must have three acute angles and is equilateral.
It impossible for a triangle to have three acute angles. * * * * * What? A triangle most certainly can have three acute angles. Such a triangle would be called an acute-angled triangle!