What did Colonel Imam compare to weighing frogs?

Colonel Imam compared the ordeal of organizing the Afghan mujahideen into structured fighting units to the difficulty of weighing frogs.
The author uses visual imagery to give us an idea of how difficult it was for Colonel Imam to organize the Afghan resistance forces. Frogs are notoriously difficult to corral and get a hold of. This is mainly because frogs secrete a type of mucus to protect their skin.
In the book, Malala tells us that Colonel Imam boasted about training 90,000 Taliban fighters. So why was Colonel Imam from the ISI training these fighters? The text tells us that the Soviet Union invaded Afghanistan in late 1979, which caused many Afghans to pour into Pakistan. Colonel Imam took the opportunity to train many of these displaced Afghan men.
The goal was to put together a formidable resistance army to fight back against the Soviet Union. At the time, Pakistan received military and financial aid from the United States and other western countries to make the resistance against the Soviet forces possible.
Despite the Afghan desire to fight, Colonel Imam experienced difficulties in organizing the Afghan forces. Ironically, one of Afghanistan's main complaints about Pakistan was the latter's support of Taliban forces, which Afghanistan considered a threat to the social order.
The historical tensions between the two countries may have also contributed to Colonel Imam's difficulties. This is why he compares the ordeal of organizing the Taliban forces to the difficulty of weighing frogs.
https://dailytimes.com.pk/264007/historical-perspective-of-pak-afghan-relations/

https://www.burkemuseum.org/collections-and-research/biology/herpetology/all-about-amphibians/all-about-frogs

https://www.popsci.com/frog-mucus-contains-flu-fighting-molecules/

Malala is discussing the period of history in which the Soviet Union invaded Afghanistan. The Soviet invasion spawned a resistance movement called the mujahideen. They were supported both financially and militarily by the United States as the invasion was seen as opening a new front in the Cold War. The mujahideen were also backed by the Pakistani government, headed by General Zia and an ally of the United States. The prime role in organizing the Afghan resistance was taken by Pakistan's intelligence agency, the ISI. The officer heading the ISI's program was Colonel Imam. Although the Afghans are renowned as being brave fighters, as Malala acknowledges, it proved very difficult to organize them into an effective fighting unit for this mission. Indeed, it was so difficult that Colonel Imam likened organizing the Afghans to weighing frogs.