Is there a better way to reference datasets by name within a list in R?

Question

I'm trying to loop through several data frames that I import and convert all the variables to lowercase. I currently do it this way (I have about 20 data frames in my actual code):

datasets <- c("iris", "mtcars")

for (i in 1:length(datasets)) {
  df <- as.data.frame(get(datasets[i]))
  colnames(df) <- tolower(colnames(df))
  assign(paste0(datasets[i]), df)
}

I've previously read that using get and assign are not best practice so I was wondering how I could do this differently.