Dear Sri Narendra,
You can grow any short duration crops pertaining to cereals, or vegetables, or green manure crops and/or flower crops like mari gold, chrysanthemums etc, if you have sufficient water source.
As mango plants are monster eaters and will not encourage other big trees, I suggest you not to go for long duration fruit and/or flower crops.
In the new land, which is with teak trees , clear all the bushy plants, make weed less, and go for any fruit/or plantation crops. Keep it in mind that country chicken is very fond of new shoots of any plant and hence you should not introduce them in to the land, when the plants in it are at a height lesser than 3 ft . For example if you plant tissue teak plants, pl wait for 3 to 4 months, and in that time shoot height will be more than 6 ft, or go for guava fruit plant , in 8 months the shoot area height will be more than 4 ft and at those heights, the country chickens can not spoil the plants shoot portions.
If you go for country chickens, construct a shed with a measurment of 1.5 sq ft area x no of chickens for night stay with fully meshed and also protect the land with wire mesh of size 2 inch x 2 inch with 6 ft height ,all around the 2 acres.
For short term gains ,guava is better and for long term gains ,teak is better. In teak , go for tissue culture and in guava, go for Allahabad safeda, L 49, or VNR Bihi varieties. you can go for sapota, aple ber, papaya, banana, custard apple, if you want fruit varieties.
With best wishes, g.p.Rao, farmer