Yes - they are quite easy to make in such manner, however some things should be remembered. Heating salts of hydrazine with oxidant nature acids can produce strong explosion. Then working with hydrazine salts, especialy those witch can be source of oxygen, one should be cautious, since redox systems due to reductant nature of hydrazine at elevated temperature or in melted state and are quite unstable. Literature describe preparation such salts as chlorate and perchlorate, but work with this salts should be carried out with great care. Dibasic salts of hydrazine are thermally unstable and decompose with intermediate formation of corresponding monobasic salt and free acid. Heating of hydrazine dinitrate leads to formation of hydrogen azide among other products, so evaporation of solution with slight overheat can lead to nasty results. Monobasic salts of hydrazine are generally more stable in solution and are VERY soluble in water, often have low melting point and are difficult to crystallize.

YSome long time ago i made both N2H4*HNO3 and N2H4*HClO4, both are components of astrolite explosive. Here is some more information about this salts.

Hydrazine mononitrate (N2H4*HNO3): White or slightly yellowish crystalline solid with melting point at 70C, is excessively soluble in water (175g at 100 ml at 10C, 266 at 20C and 2127 at 60C). Substance begins to volatize without decomposition at 140C, not showing significant decomposition up to 300, decomposition of solid residue begins at 180 and becames explosive at ~270C. Easily inflames on the air, causing strong explosion then confined. Then dissolved in strong sulfuric acid decomposes with formation of nitrogen oxides, then heated with delute acid forms hydrogen azide as one of reaction products. Contact with oxidizers such as KMnO4, chromates and hydrogen peroxide causes inflamation. Melted salt at 70C explodes with 8500 m/sec velocity, 5640 m/s at 1.25 g/cm and 8510 at 1.59 g/cm. Non compressed sample containing 0.5% moisture detonates from cap with 0.25g of mercury fulminate, compressed to 1.6 g/cm3 requires 1.5g. Sensitivity to impact is 50% with 200-150 kg/cm. Brisance is 82% of TNT, Trauzl block test is 120.4% vs picric acid, TNT equivalent is 1.42.

Hydrazine dinitrate (N2H4*2HNO3): Solid witch melts at 104C then fast heated. As dibasic salt it is much more unstable then mononitrate. Then heated slowly, approximately at 80C it begins to decompose without melt, forming hydrogen azide along with other products. Even in dessicator with H2SO4 drying is accompanied by formation of HN3, residue consists of hydrazine mononitrate and ammonium nitrate. Good soluble in water, but solutions containing more than 30% of salt decompose on heating. More powerful explosive then Tetryl but less powerful then PETN.

Hydrazine perchlorate (N2H4*HClO4): Can be produced by neutralizing dilute solution of hydrazine with dilute perchloric acid. Compound formed is N2H5ClO4*0.5H2O it is stable up to 60C. Anhydrous salt can be prepared by crystallization from ethanol. It is crystalline solid with melting point at 137-138C forming colorless liquid. Decomposition begins at 145C and is finished at 230C (on cautious heating), fast heating causes strong flash. Impact or friction cause violent detonation. Sensitivity of anhydrous salt is similar to primary explosives, but hydrate is much less sensitive. Solubility is 23.6g in 100 ml H2O at 0C and is 93.1g at 75C. Almost insoluble in ethanol at room temperature but at 60C it is 69g in 100 ml. Unsoluble in ether, benzene. Attempt to produce hydrazine nickel perchlorate from nickel perchlorate in water solution in 5 days lead to formation of bluish solid, witch exploded violently then glass stirring rod was introduced to the mixture. Trauzl test for hydrazine perchlorate gives 113% of picric acid, and 122% of TNT.