A "harasser" is someone "who makes others feel uncomfortable [by] using words", gestures, and touch.
A "stalker" is someone "who makes others feel uncomfortable" by persistently trying to interact with them, either by using information they thought was private, and/or after they had told the stalker to have no further contact with them.
As Arrowfar suggested, "lowlife" is an offensive term for a poor person who might have criminal intentions.
"Crook" is a mildly offensive term for a criminal. For example, when Richard Nixon said, "I am not a crook", it immediately made many people think he was a "lowlife" and unworthy of being President.
"Mugger" is a factual (but still insulting) term for a criminal who robs people on the street or in alleys by force (or threat of force).
"Thug" is an offensive term for an intimidating, possibly criminal, person. Many bodyguards and muggers are called thugs.
"Rapist" and "child molester" are factual terms for people who commit particular crimes. Because these crimes are so abhorrent (especially to many imprisoned criminals), they are very insulting terms. (Many criminals consider it honorable to harm or kill rapists and child molesters.)
I think baby talk is the common and proper term. It refers to the words or sounds a baby makes when it's learning to talk. In addition, it also refers to special language adults sometimes use to talk to babies.
We also can call it babble. We can use babble both as a noun and a verb.
Best Answer
The word you are searching for good sir is the word Romani
In terms of the application of the word to describe a family or group you could correctly use the designation "Romani people/family/group" as it distinctly refers to the "Gypsy" people that inhabit a wide variety of countries.
As per my knowledge and research there is no word that is similar to "şatră" specifically describing a family unit in the gypsy culture.
This is the most i can do for you, I looked up the Romany language and I'll list out the words Romani/Gypsy and family for your convenience.
Hope it helps