I came across these sentences in which ( as much as) is used when I expect to use ( as many as) and vice versa:
1- This is half as many as trusted him six months ago.
2- We just grabbed as many as possible. ( Collins dictionary)
3- Some of these fish can weigh as much as 80 km. ( practical usage)
4- Elephants can e as much as 10 feet tall if not more.