An isosceles triangle has at least two equal sides. It's name is derived from the Greek isos which means equal and skelos which means legs. The current spelling comes from the translation from Greek to Latin.
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The third angle of an isosceles triangle doesn't have a name.
An acute triangle can be an isosceles triangle, but it doesn't have to be. An isosceles triangle can be an acute triangle, but it doesn't have to be.
A right triangle and an isosceles triangle have the fact that they are both triangles in common. A right triangle can also be an isosceles triangle.
You cannot. An isosceles triangle cannot be scalene and a scalene triangle cannot be isosceles. So an isosceles scalene triangle cannot exist.
An Isosceles Triangle