It is said by a boy who was running away from a danger situation.
Is it an alternated version of the word 「助ける」? Which dialect is it?
I would say that it is only a lisping pronunciation of 「たすけて」 = "Help!"
I would not call it dialectal unless this character says other words or phrases that are clearly dialectal.
in this case, 助けて【たすけて:tasukete】is right. (means "help me.")
I agree with l'électeur, but it might just be a spelling mistake. I and U are next to each other on the keyboard.