Identification Of These Indian/Tibetan Coins?

The silver Tibetan coin is the Gaden Tanka. There are many varieties in this. The square one is an Islamic token also colloquially called 'Akbar char yaari' token.The round copper coin on top has its image reversed...it is likely a Sikkim Namgyal copper paisa. The last copper coin maybe a tibetan tso (judging by size) although not sure.

The tokens come in silver as well as a base alloy. You may need to test the token to see if it is silver. It is called char yaari token in the Indian subcontinent because it resembles the Akbar square rupee with the names of the four caliphs inscribed on the corners who succeeded prophet mohammed. This design of the square rupee caught on with the public and many ascribed talismanic attributes to these rupees (lucky coins). The islamic tokens in base metals, silver plating and even silver were produced by the jewellers to meet the demand of these lucky tokens. This type of islamic tokens were minted contemporary to the square rupee of akbar and thats why they are called the char yaari token! There are many varieties of the Islamic tokens. See this link for identifying your square islamic token.
http://indiannumismatics.com/products.php?id=172

Here in the West we call tokens like the square one "Indian temple tokens", a rather generic name and perhaps not particularly applicable to Islamic types such as this one (since Muslims don't have "temples"), but it is what collectors generally call these pieces. Do a forum search for "Indian temple token Akbar" and you'll find several pages of old threads with similar pieces.

Now, for your other coins.

Top left: a "Ga-den" tanka, as already noted. The introductory paragraphs to the Krause catalogue give a general guide to the classification of these coins, although you can buy entire books on just this subject. The basic classification is determined by the symbols that sit in between the eight lobes on both sides. Yours has just single dots in between the lobes on both sides, so yours is the type listed in the Krause catalogue as KM/Y# H13.1, undated but known to have been struck in 1929.

Top right: a copper paisa from Nepal, dated VS 1969 (AD 1911), listed in Krause as number 685.1.

The coin in the 2x2: I think it's a 5 skar, KM/Y 17.1, though I can't read the date clearly enough to confirm.

Here is what I have been told about a similar square coin:
Obverse: "Muhammad" in the center. "Hasan" in above right corner. "Hussain" in the below right corner. "Ali" on the above left corner and "Fatima" on below left corner. Reverse: kalima.
This is Shia Token. Shia is one of the major sect of Islam which believes that Prophet Muhammad's son-in-law Ali should have been given the opportunity to be caliph after Muhammad's death. Prophet Muhammad had 3 sons and they died in childhood. He had 4 daughter and Fatima was the favourtive daughter. Ali was the fourth caliph and married Fatima and had two sons Hasan and Hussain. All these four names are present on this Token. Ali, Hasan and Hussain were killed on different occassions and Ummayad dynasty (capital at Damasus, Syria) took over the caliphate in 661 CE. Abbasid dynasty (Capital at Baghdad, Iraq) took reverge in 750 CE and killed all Ummayad people except one, who escape to Spain and ruled there.

Oh, also SAP. I wanted to confirm something else. I was looking in krause to reference the "copper paisa from Nepal, dated VS 1969 (AD 1911), listed in Krause as number 685.1" I checked the krause reference and 685.1 is the 1968 machine struck. 685.2 is hand struck and 1969. I want to confirm as it changes the value here. Plus, good to know if it is machine or hand struck!

perfect, thanks!