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No.
Tayammum instead of Ghusl is allowed only if Ghusl is not possible e.g. no water, no enough time, health reason preventing Ghusl, etc. 

Convenience alone is not a valid reason to leave Ghusl and do Tayammum in stead of it. Ghusl remains obligatory because it is possible even with little difficulty, and in such case Tayammum will be invalid.

Wassalam.

When Ghusl is not possible, Tayammum must be performed to perform the obligatory Prayer within its time. Tayammum can be performed on any material of earth e.g. dry soil. Sand, stones, dust, etc. Wudhu does not suffice when Ghusl is not possible, but Tayammum is the only alternative.

Wassalam.

Grass itself is not part of the earth hence Tayammum on grass is invalid, but it the grass is covered by soil or clay, Tayammum will be valid on soil or clay or sand etc being part of the earth.

Wassalam.

Tayammum is to be done, but it is good to do both Tayammum and Ghusl as precaution.

Wassalam.