Downloading URL using AWK for fixed fields
awk '{print "wget " $9 " -O " $1 "_" $2 ".fastq.gz"}' tmp 


will give you 

wget https://www.encodeproject.org/files/ENCFF001JPX/@@download/ENCFF001JPX.fastq.gz -O a_k.fastq.gz
wget https://www.encodeproject.org/files/ENCFF001JPZ/@@download/ENCFF001JPZ.fastq.gz -O b_k.fastq.gz
wget https://www.encodeproject.org/files/ENCFF001JQB/@@download/ENCFF001JQB.fastq.gz -O c_k.fastq.gz


If you add a | bash to the command it will then execute all the wget commands.