A "word" question

   This word is used to describe a person "short and stout", and initials with letter " T" ,and sounds like ['ta:bi]. I can not speak it. If any friend know it,please, tell me . Thank you.

i think you mean "tubby"?

as in short and fat?

[tub:e]

does that help? 

probably taken from the words,bath tub

tub as in wide. 

Yes, yes.Thank you. 

Thanks from me too as I was also lost on this question . Maybe people were too polite to refer to me as tubby.

tubby
adjective INFORMAL
(of a person) fat:
Our chef was a genial, slightly tubby man.
 (As already stated, the u is pronounced as in tub or in cup)

Similarly, there's "chubby" – what a nice, chubby baby! Chubby is to be fat in a pleasant way. 

Another word with similar spelling  is "tabby", which is usually used when referring to cats.