This study is being conducted to learn about the effects of SC-PEG, which is a new form of a chemotherapy drug called asparaginase. Asparaginase is used to treat ALL and lymphoblastic lymphoma. The standard form of asparaginase, called Elspar, is given in the muscle once a week for 30 weeks. There are other forms of asparaginase. The investigators will be studying two of these: Oncaspar and Calaspargase Pegol (SC-PEG). The investigators have previously studied giving Oncaspar in the vein (instead of the muscle) every 2 weeks in patients with ALL, and have shown that this dosing did not lead to any more side effects than Elspar given weekly in the muscle. The study drug, SC-PEG, is very similar but not identical to Oncaspar. SC-PEG has been given in the vein to children and adolescents with ALL as part of other research studies, and it appears to last longer in the blood after a dose than Oncaspar. It has not yet been approved by the FDA. The goal of this research study is to learn whether the side effects and drug levels of SC-PEG given in the vein every 3 weeks are similar to Oncaspar given into the vein about every 2 weeks.