No.
There is no such thing as a regular isosceles triangle. The only regular triangle is an equilateral triangle. Having said that, any triangle will produce regular tessellation.
A regular polygon is one which has all equal sides. But in an isosceles triangle, only 2 sides are equal. The third side has a different measure.Thus an isosceles acute triangle is not a regular polygon.
An isosceles triangle has two equal sides and one that isn't. A regular triangle has three equal sides.
An isosceles triangle or a rhombus.
It depends. Strictly speaking, a semi-regular tessellation uses two (or more) regular polygons and, since neither an isosceles triangle nor a parallelogram is regular, it cannot be a semi-regular tessellation. However, a less strict definition allows non-regular components.
There are isosceles trapezoids which are sometimes called regular trapezoids.
8
No although it has 2 equal sides
A regular polygon is a shape in which all angles are equal. An isosceles triangle has two equal sides, thus two equal angles, but the other side/angle differs. Therefore an isosceles triangle is not a regular polygon.
An isosceles trapezium.
Only if it is a regular tetrahedron, regular octahedron, or regular icosahedron. All other geodesics have isosceles triangle faces, not equilateral triangles.